Apologies on the formatting here. I think citing everything on this topic is absolutely critical since it's absolutely rife with misinformation. Dealing with formatting for extensive citations, alongside quotations of materials (for those who don't feel like perusing the first party sources) is tough in little more than ASCII and italics!

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The evidence is not too hard to find. This [1] site provides an extensive and ordered collection of most published Snowden related documents. It's also quite nice since it ties the documents to the first press coverage as well, if you'd rather peruse something other than the raw data. There seems to be a curiously large amount of misinformation on this topic, but when you actually look at the evidence - this situation is not in the least bit ambiguous.

These [2] slides give a broad overview of what PRISM is:

- Slide 3 describes PRISM: "PRISM -Collection directly from the servers of these U.S. Service Providers: Microsoft, Yahoo, Google, Facebook, PalTalk, AOL, Skype, YouTube, Apple".

- Slide 5 describes what is collected: "What will you receive in collection (surveillance and stored comms)?" - "in general" : "email, chat - video + voice, videos, photos, stored data, VoIP, file transfers, video conferencing, notifications of target activity - logins, etc, online social networking details, SPECIAL REQUESTS (caps added here to represent the bolding in the slide)".

This [3] is a document entitled "User's guide for Skype PRISM Collection". It gives some insight into how the program operates from an operative level including screenshots. It details surveillance of skype conversations, including conversations between skype and a landline connection. In skype-skype connections surveillance is available for audio, video, chat, and file transfers. It also mentions another program "DECODEORDAIN" which apparently maps different email addresses to a single person (used when engaging on surveillance on a target with skype registered under multiple email accounts).

That document also details that as data goes from Skype's servers, it also goes directly to the NSA. So this leads to situations where their agents can apparently become a bit confused about receiving multiple copies of the same chat log. That might happen, for instance, when a user logs onto a different device and his chat history is resyced so it goes from Skype to him as well as to the NSA. That's all made even more interesting by the fact that this was back from 2011 when Skype was still peer to peer. So while we get hints of how their process worked, the exact mechanisms are still a bit obscured.

There's a lot more really interesting stuff as well, but you could spend years going through all of it. Anyhow, suffice to say - no the government isn't just collecting just metadata. Anybody that says that is spreading misinformation either intentionally, or because they themselves have been misinformed and now think they're informing others.

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[1] - https://snowdenarchive.cjfe.org/greenstone/cgi-bin/library.c...

[2-article] - https://www.washingtonpost.com/investigations/us-intelligenc...

[2-slides] - https://snowdenarchive.cjfe.org/greenstone/collect/snowden1/...

[3-article] - https://www.spiegel.de/international/germany/inside-the-nsa-...

[3-document] - https://snowdenarchive.cjfe.org/greenstone/collect/snowden1/...