Already covered - I would like to think
Don't know about most people here, but about eleventy-seven security and privacy goofs back I went through my Facebook profile and deleted EVERYTHING that I could. My profile has two things: My City (which makes sense) and my e-mail address - hardly a secret.
Almost every privacy setting is set to "Friends Only" and I vigorously block all the stupid spam that Facebook feeds me, and aside from "Scrabble" don't accept requests from games and apps and other dreck.
Still, I have no illusions about what Facebook might have on me, and who they would sell it to.
Funny things is that I have no real qualms about handing large swaths of my life to Google, storing my e-mail on their servers, and have never found their advertising particularly irritating.