I"d like to add that I'm also OK with Facebook/Google/whomever making money off that. I think it's just a spectrum of perspective. One side is privacy concerns, the other is the win/win/win where I see ads relevant to me, facebook makes a little money [in exchange for providing a free service that I value], and the advertiser makes a sale for promoting a product that I want.

I don't know the right answer, but I think there's a balance to be struck.