Today to close out its f8 developer conference, Facebook VP of Product Chris Cox took the stage to talk about the evolution of Facebook over the last six years, and how the company's core principles have largely remained the same. During his presentation, Cox recounted Facebook's early days, when the site's profile photos were often of keg stands, and there weren't Events, Facebook Chat, or even Photos (though you could see if your friends were logging in from a campus dorm — remember that?). Cox detailed how the then-small group of around ten engineers would watch how users were abusing existing features — like creating a personal profile for a fraternity, or, later, a Group for an Event — and implemented new features accordingly.