I've been using FB for connecting with my RPG group (we've been playing Eclipse Phase via Skype. It's awesome). People generally post songs and stuff from 9gag and the like. It mostly falls under either of those categories. I once made the mistake of getting into a discussion about space exploration on FB: Someone posted this letter of note, which encourages space exploration, and the person disagreed with it. I had a terrible time making myslef clear. FB wasn't made with long discussions in mind: the lack of markup makes it quite clear. Also, you can't search updates, which makes them disposable. You can always use the hide option: it lets you sort what types of updates you get from your friends (Photos, games, comments, music etc.) without having to unfriend them.