Earlier quoted context omitted.
What are they making money off? I have never heard of anyone clicking an ad on facebook. (conversely I have met few Internet users who have NOT clicked a Google ad) They could be selling data/information. If so, I hope it's anonymized.
full disclosure: I build/make money from facebook apps Facebook made under $300 million last year, was a little shy of breaking even... Why is this surprising to so many? There are dozens of developers that are netting 100k+ a month (yes i actually talk to one of them quite often), and at least half of this is from ads. Facebook is the largest social network in the world and growing at about 1 million users a day; wh…
What is the other half from? Do facebook users pay for applications? Are users buying services? (I can see a travel agent service.)