Facebook sucks.
FB is part of a very modern peer-pressured social terrorism that demands (a) that everybody is constantly blabbing, even if the blab is about trivial nonsense (because otherwise you will be called ‘asocial’, which in many environments is considered the worst condemnation possible), (b) total transparency to the point of social exhibitionism.
This has actually become the subject of serious philosophical inquiry. See, for instance, Psychopolitik. Neoliberalismus und die neuen Machttechniken, by Byung-Chul Han (in German. I don’t know whether there’s an English translation already; translated the tile would be “Psychopolitics. Neo-liberalism and the new techniques of power”). See also his The Transparency Society (see the description at Amazon. Sorry, as a new user I'm not yet allowed to add a URL here).
Surprisingly many naive people indulge in FB exhibitionism, without the slightest sense of privacy: we all have seen the persons who divulge everything about their private life, their relationships, where they spend their vacations, which movies and TV shows they have seen, whether they have had a headache today, etc. etc.
I think that such people are pathetic. They have no dignity at all. There is so little in or about them that is worth keeping private that they spill everything about themselves onto the street.
I have a FB account, where I have mentioned things about myself that can be found on the web already anyway. I have the account only because I know a few people who like to send around news through that medium. Whenever I want to inform somebody about something, I will write to those persons privately, and not to the whole world.