skysight-inc/HackerNews huggingface dataset:
How could Facebook do this (technologically)?

According to a redditor,

"

- It's not IP address. Facebook successfully identified a number of specific locations (bars, theaters, etc) even though I had uploaded the photos from my home

- It's not geo-tagging. All of my photos were taken with a camera that does not geo-tag (Nikon d700).

- It's not contextual tagging. There were no people tagged in the photos, no comments in a lot of them, no words or phrases or names in the captions that could have given clues

- It's not image recognition. One set of photos was taken at Cafe du Nord in SF, CA and every single shot was of the performer onstage, with no identifying characteristics or clues to be had.

"

I would really like to know as this is very interesting and none of the reddit comments (as of now, 12 hours after submission) really answer this question. What technology or methods are they using to suggest (accurate?) locations where pictures have been taken from?

Even more strangely, I have never used my mobile phone with Facebook, but when I uploaded a photo just now of a place from my childhood to which I haven't ever been since using Facebook, Facebook correctly suggested the location.

What the heck?!
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Probably lengths like this:

http://arstechnica.com/tech-policy/news/2011/12/itc-initial-...
Looks like WebGL is really catching up. I see many posts on webGL these days by fellow hackers. I hope it will be a great success.
Here's my guess at how it's done:

Redditor has facebook app installed on their smartphone (or just uses the website), sets status to "OMG wife is going into labour, at the hospital now". Facebook now knows roughly where redditor was at the specified time based on the ip, they can narrow this down further by looking at keywords in the status message and check it against a list of addresses in the local area and select the best match.

When the redditor comes to upload their photos days or weeks later, facebook just checks the photo timestamp against the user's location +/- X hours and makes a guess at where the photos were taken.
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> Yes, it's one sided. It's an opinion piece in the comment section, and labelled as such. This is indicated by the breadcrumbs at the top reading "Home / Opinion / FP Comment".

This strikes me as a rather poor excuse (if it's intended as such). I agree nobody should expect an opinion piece to be vigorously researched, cited, etc....but all opinions are not equal. There's a difference between someone who is just casually writing their thoughts with the understanding that they are not fully vetting them...and someone who is clearly biased and pushing a particular agenda.

> Wait, they didn't seize his computers because of one particular comment left on his blog by someone unknown?

Well, we can't know all their reasons...but based on the facts so far...no they didn't. They seized them because he referred to a possible hacker as "our old friend" and wrote an article/linked to the hacked emails....AND because a potential hacker commented on his blog, possibly leaving evidence in his account/on the server...then refused to cooperate with the investigation.

Are they justified doing so? I don't know. I think the "old friend" comment is innocent. I also think based on what we know it's pretty frivolous. Unless they have some clear evidence linking this guy, I think they are overstepping their bounds. Of course they might have it...they're not gonna say.

One thing I would also say is that I don't think this guy is being treated any differently than anyone else who gets in the way of any government investigation (that is to say, poorly).... I hope climate change denialists don't hold this up as some sort of proof of their conspiracy theories.
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This is definitely not a failure of your immigration system.

They didn't even move to the US to start this, it started in the UK and then, let's be frank, they went off to the US for a jolly holiday. Now they're going to Hong Kong for a jolly holiday.

All props to starting a business, etc. but if you can't sell Buffer from the UK and you can't sell it from the US, you're not going to be able to sell it from Hong Kong.

To everyone saying the US lost a great team, they didn't need to be there. The company was setup in the UK already running, it started in 2010. Joel was standing in front of me practically a year to the day in the UK advocating bootstrapping and now he's suddenly raised $400,000 for a trivial twitter app. How on earth can you spend $400,000 on a tweet scheduler?

The guy's great, I think the apps great for what it is, yes they're having a great time travelling the world. I appreciate people can change their minds.

Also they're probably a UK company and pay UK corporation taxes, not US ones, but I'm not sure as their terms of service and their website don't explicitly say who the legal owner of the app is or their registration number or registration address (illegally I might add if they're from the UK). If he's running it as a sole trader he should explicitly say so in his terms of service.

EDIT: Joel's deck from Dec 2010 advocating bootstrapping:

http://notttuesday.com/2010/12/17/joel-gascoignes-lean-start...
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I too would like to see the performance improvement if he enables back face culling.
The logic doesn't hold up. I uploaded a bunch of photos taken in Christchurch, New Zealand. The pics were over two years old and I now live in the UK and uploaded them from here. The photos were also taken on a cheap, point & shoot camera, not a smartphone.
In short, it's another way to lower the barrier to entry. Well played.

From my experience with threddie I learned there are a great many people out there who behave like consumers in the way they go about discovering new apps but, because they're decision makers at their companies, they end up B2B customers.

I'm not sure I like the idea of B2B saas companies employing B2C tactics en masse, I fear it would make for a silly red-and-yellow landscape where everything is FREE FOREVER SIGN UP NOW. Price transparency is good for everybody and it helps move the market forward (material for a blog post right there).

Alas, I fear I'm going on an off-topic tangent here, though the subject is intriguing. Thanks a lot for sharing your insights in this matter. I might drop you an email later. Cheers!
Maybe it infers from the locations of your friends. It looks like more than one technique is used, though; probability-weighted heuristics.
but did you use facebook at all when you were in new zealand?
Guess: your friends also took pictures of the same events from similar angles and uploaded them, fb worked out their location from one of the other suggested methods, and then matched it to your photos through simple computer vision algorithms.

Or, you used facebook at some point while in that city, facebook recognised that your photo was of a baby just born, by comparing it with the millions of other photos tagged with "OMG MY BABY IS BEING BORN!," it knows that babies are born in hospitals, and it knows that there is only one hospital in that city, so it guesses that the photo was taken in that hospital.
Great, thanks for the info!

Finally IntelliJ Scala got a serious competitor.

The features in the video look great, hopefully they also work like that in practice!
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I really enjoyed the interview but I found this exchange puzzling:

Emily Chang (quoting Max Levchin): ‘Entrepreneurs aren’t taking big enough risks … ’

Paul Graham: ‘Well, that probably isn’t true because it’s gotten cheaper and cheaper and cheaper to start a startup and when the cost of failing gets lower usually people can do riskier things’

Risk is the potential for loss. If the cost of starting a startup is lower then the potential for loss is lower which means the risk is also lower. More people are starting startups because it is less risky, not more. That means the number of companies being formed is going up; in turn, that means that more people are taking the risk of starting a company, whether they are risking much or not. This might seem a subtle distinction but I think it is an important one.

A week ago I sat down opposite an entrepreneur who built a 24-hour transaction layer on top of the UK’s banking system which runs on nightly batch-processing. It made the transition from 9-3 banking to 24-hour online banking possible. He started out with a really big vision and had to take really big risks and the result was a really big company that created a lot of value economically and socially. It took him two decades and nearly bankrupted him on dozens of occasions. His vision sustained him. It kept him going through all the terrible lows and in the end he shook up one of the slowest-moving industries out there. That was a big risk. That was a big reward.
Birds? Eggs? What are these egg-laying birds you speak of? They're not in the game.

Wise not to mention them, from an afraid-of-well-paid-lawyers point of view.
fft.js supports as large buffers as JS can handle, that depends a bit on the browser, but 256k samples will probably work, you might have some trouble in Chrome, if you have too much other stuff in memory as well. Would be cool to see a demo of PADsynth on the web, especially with audiolib.js!!!

Paulstretch would be a perfect addition to the library, it would open whole new doors for example for samplers (whoa, the sample is sustained forever!), of course with some limitations in regards of real time. Send me a message on GitHub, if you decide to take up on the task, I'd be glad to give you a hand with it! :)
Indeed but when I posted the pics it was 2 years later from a totally different continent and no reference to the location on the photos.
It doesn't need to be taken on a smartphone. It's sufficient to open facebook on a smartphone only once (app or web) in roughly the same timeframe that the picture was taken. It can then look where one has been in the timeframe when the picture was taken by comparing the picture timestamp with the list of checkin ip addresses, and do a geolookup of the ip address against a location database.
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I think everyone wants YC to pick the best candidates (thus making the best startups who make the best products for us to use), but I also want them to not systematically overlook qualified candidates due to external factors. If there's a way to tweak early-childhood education to turn more women into potential startup founders, hackers, etc., that increases the number of startups and hackers available for startups, which is awesome.

It would be reasonable for YC to use successful women/minority applicants (Jessica Mah; Leah Culver; I'm sure there are others, plus of course Jessica Livingston's role as a partner) to demonstrate that women can be successful in startups. Other than that, it's really something for parents, K12 educators, etc. to address.

Women do seem to be a lot better represented in bio/biotech than in computers/ee, so if over time more startups happen in the bio space, that should help to address the imbalance too.
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I haven't ever been suicidal but this last year I've allowed myself to think about it because of the complete pointlessness of just about everything I've done (or more commonly, not done because it was pointless). Sigh.
I particularly hate autostarting videos with loud preroll ads :(
I reckon they use image recognition too. I have a gash digital camera that gets a lot of use; no exif data beyond camera make/model.

Anyway; in 2005 I went on a skiing trip to Chamonix. Pics were uploaded about a month later, no Facebook activity at the time (or while I was there). The other day FB asked me if they had been taken in Chamonix. So... something else used there at the very least.
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Miller-Rabin isn't that hard to implement - it just needs some reasonable maths skills related to modular arithmetic, and a copy of Knuth for fast versions of some algorithms helps a lot as well.

I've stuck a very simple version (in C#) here - https://github.com/elemeno/SimpleMillerRabin/blob/master/Sim...
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right, but assuming the timestamp is on the photos, facebook still knows where you were at the time they were taken. The time you upload them is immaterial
Creative solution! You can knock it down a character by removing the "1" and simply returning an empty tuple.

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I would vote for keeping it. It's obvious from the title it's sort of off-topic but it's indeed a great article on hacking the minds of kids to open them to difference
Eventually someone evil will do something truly monstrous on Facebook and it will make this WTF look like a drop in the ocean. I fear for my friends who are still Facehooked.
I first got these notices about... oh, best part of 2 months ago. I assumed it was everywhere but perhaps not!
Again, that doesn't align with my experience. The first smartphone I owned was when I arrived in the UK. In NZ, I was restricted to an old Nokia work phone.
In the UK the directors of a closed company are required by law to maintain a degree of confidentiality. While this does not necessarily imply that the employees cannot be told things, the employees are not themselves bound by the same requirement for confidentiality. Therefore telling the employees things effectively releases them from the control of the directors, and that can be construed as a breach.

Additionally, not every employee has the same point of view, and not every employee has the same degree of understanding. A small blip that is, in truth, minor and irrelevant may be regarded with concern and possibly horror by employees who are otherwise intelligent, enthusiastic, and committed. This can cause concern for them where none is necessary.

So perhaps some should be told and others not? There is the consideration of "fairness" - some employees get very upset and concerned if they feel that others have information that they don't.

In short, there are serious problems with trying to share detailed information about prospects, negotiations, revenue, contracts, expenses, profits, cash-flow, etc, with the general work force.

This is not to say that there should be a culture of secrecy, but complete openness is potentially dangerous. Certainly in my experience, more than once, significant openness has led to significant problems.
Purely speculation but perhaps he is carrying his phone with him and it is correlating his location with the timestamps on the images, or perhaps he marked himself as attending an event which is at the venue.

From an image recognition standpoint, if anyone else was at the event and took similar sets of photos which they then tagged, that could also be used.
You know, it's always a visceral pleasure to hear/watch pg talk; at least for the way my brain is (soft-)wired, he's so charming and listenable.

But every time I see him interviewed, my "he's got an axe to grind" detector is going off so loudly that it's starting to drown out the charisma. It's understandable, in that high-tension soundbyte-oriented environment, that pg wants to ensure he stays on-message, but it's also disappointing from someone who we know is capable of being so much more informative.

He says, in response to several questions, "oh, that's not how a perfectly rational market would work, so it's probably not what's happening". I mean, I agree with the argument as far as it goes, generally reality roughly approximates an ideal market, but the approximation is always rough, and pg repeating this is sort of wasted air, isn't it? Examples:

at 2:08 in response to "big enough risks",

starting at 2:38 in response to valuations like Dropbox's,

at 5:25 in response to Aston Motes's very plausible theory about bias in "pattern-recognition"

Everyone's entitled to try to manipulate the media as best they can, and I'm not even doubting the sincerity of pg's claims about the market's effect on all those issues. But it sure would be nice to hear you dig a little deeper, pg.
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They dont have 500k users.Did you even read the article?
OK we get it - there are lots of planets out there. Given there are billions of galaxies, each with billions of stars, I expect there are quite a few more.

Given they are all a very long way away and not getting any closer any time soon, news value for subsequent sightings - zero.
One of the earlier demos (about a year old and unfinished) : http://niiden.com/orbisyn/ :) has a virtual MIDI keyboard, to which you can connect a MIDI synth if you have Java. It isn't exactly native support, and it's very unpredictable, but it's something that can be used meanwhile.

However, the Device API should allow access to external inputs, such as microphones and MIDI controllers, so it's coming along!
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I vote cell tower info.

I have a Nokia phone with no GPS. Many programs uses the cell tower info added by the phone to determine where the photo was taken.
The important thing to take away from this:

If they can make guesses this accurate about your photos, imagine they guesses they're making behind the scenes about your life, your personality and your innermost thoughts.

If there was a page on fb where it showed all the inferences they had made about you, sexuality, income, religion, philosophical viewpoints, mental health, etc. then people would run screaming. Of course, a lot of people have already told fb that info voluntarily, and that's why its possible to guess it for everyone else.

Also potentially terrifying: a facebook fortune telling engine. I bet they can predict your future with frightening accuracy, or they will be able to after another decade or so of data anyway.
Also, does the location info purely say "Christchurch, New Zealand" or is it more granular? I'm guessing that when facebook only has sparse information about your location, as in your case, it "zooms out" to the city, state, country etc, but the more information it can collate, the more accurate the suggestion it gives is.
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I think it's just GPS positioning by the smart phone. I wouldn't be fooled by a liar.
What amazes me is that people actually think this is the right way to look at things...
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How does Facebook use image recognition to recognize that an image of a baby on a blanket with no surroundings visible was taken inside a certain hospital? I doubt it.

Regarding your Chamonix images, perhaps your friends uploaded photos taken at roughly the same time, with geo-tags? Perhaps you are tagged in some of them? That would make for pretty simple logic:

- Facebook knows that you were at a certain place a certain time through the geo-tagging of those photos, as your user is tagged in one of them

- You upload photos taken at the same time as the photos you were tagged in

Conclusion: You must have taken those photos where the photos you were tagged in were taken.
I would argue that you're painting "agile" with one brush, except I hate how it's become yet another meaningless buzzword wielded by incompetent management, so I won't.
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http://en.wikipedia.org/wiki/Scale-invariant_feature_transfo...

Facebook almost certainly has more photo information than TinEye or Flickr, and of indoor environments probably more than Google (which has reverse image search too). Across any given bar or hospital Facebook would have maybe 5-10 other people with albums tagged with the name/gps/check-in. They'd only need one other album though.

SIFT more or less turns every image into a bag-of-words. Your single photo, even at different angles, is going to have a heavy match with photos they have. If you upload a whole album they are going to have tons of matches and they can be more or less certain of the location. To say nothing of adding even the most basic geoip-to-city lookups that would narrow you down to at least five cities that you and your social network inhabit. But the extra information they have is besides the point, SIFT is enough; hospital rooms look alike to us, to SIFT they don't.
Google is the best search engine and everyone knows that.

A massive percentage of the internet using population do not know what a search engine is. I've seen people put "www.facebook.com" into the google search bar. People do not know the difference between the google search bar and their address bar.
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Wow! A serious competitor to SIRI in place. My guess is they are using combination of techniques - Semantics of your Status as phpnode mentioned with example(heard they have plans to get into semantic search to beat google), EXIF info, IP address and also your friends replies - when is the due? which hospital or Gynic? If hospital name is not mentioned then Gynics details and her hospital location. Do you think all this is used just to make a SUGGESTION?? Its a Billion$?
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