Privacy Fix is instructive.?Who knows how accurate it is, but I bet it is directionally correct. And it says that FB makes about 5 cents a year off ads delivered to me, whereas GOOG makes about $32. I have most of my privacy settings cranked up (on both GOOG and FB), so maybe FB does a lot better with other people, but that is a factor of a 1000.
via A Little Ludwig Goes A Long Way » Why FB is worth just a fraction of GOOG.