I think another HN reader as well as myself mentioned this earlier: Amazon has a much richer dataset than Facebook, and the context of purchasing when you visi

I think another HN reader as well as myself mentioned this earlier: Amazon has a much richer dataset than Facebook, and the context of purchasing when you visit the site. Their recommendation algorithms have cost me so much of my money, I don't even want to think about it. The implied and clustered behavioral data for advertising is all there, whether people are "friends" or not. The only thing I see that they lack is a buzzphrase like "social graph".