I need to explain the user interface of Facebook to one of my clients but it would be a lot easier if the interface didn’t change every week and it didn’t had 4 points of contact for settings all in different places. I guess design by committee is at work here.
My guess is that (just like other big players) they have a team for each part/page/section of their platform. There is no cohesive product vision and no product principles (promises) to the users.