To expand and clarify: I always say this (and mean it) facebook is a great tool, its just not for me.

I don't know everything about my social circles/family because I get it from a website newsfeed or because I browse pictures on a website. I know because I have personal communication with the people involved. I know someones birthday because I remember it, not because facebook told me about it. My friends/family will share with me when they get an SO/engaged/married/divorced, not a website.

I don't wan't a layer between me and people. For some people it works very well, and good for them, I mean that, it just isn't for me.