Well, what Ive seen recently, is that people use Facebook only to announce their 'important' activities and like all the bullshit that is moving around internet. Every time I see there, that somebody has posted: 'off for a lunch', 'back from lunch', 'be back in 2 minutes' etc. And later everybody has to like it or share it, but still in the end, nobody cares.
That is why I try to use facebook as less as possible, because I dont see the real reason of using it.