This article mentions Snapchat's hundreds of employees and multiple offices. This is one of the most obvious examples of the "what are they all doing?" question

This article mentions Snapchat's hundreds of employees and multiple offices. This is one of the most obvious examples of the "what are they all doing?" question for me. I know it must take quite a few people to run operations at that scale, and of course they have an advertising business too, which likely explains the need for multiple offices. But it seems like Snapchat is still an extremely minimal app with only a couple of extra features being added over the years. Instagram had only 13 employees when it was acquired, so what role are most of these people in?