response: Oh, I see. There was something that was released in 2012 that by 2015 had sold 70 million units.
original_response: i have never used an android phone before
history: I hate to admit it but I spend way too much time on Instagram! That's the service where you share videos and photos with people, right? Yes, what else do you know about it? I know that it's owned by Facebook. is it really? no i did not know that. that is a really cool fact. any other interesting tid bits? It was created in 2010 and only available on the iPhone at first. do you remember which iphone was the biggest seller in 2010? I do not, but that was the year that the iPhone 4 was released. i remember i had a iphone 4s. that was the only one i tried, im  more of an android person.
knowledge: Launched in 2012, it had sold about 70 million units by 2015.