If you are worried about your activities being tracked and sold, stop using your credit cards. Have you read the privacy policy on those lately?
All this anti-Facebook pride strikes me as bitterness. Everyone has a right to do what they want, but would be all the wiser to look at themselves to understand why.
Facebook gives me more than I give Facebook - a lot more. When that stops being true, I'll stop using it. I too am kicking myself for not building a social network in 1996 - I'm not going to convince myself Facebook is evil because I didn't.