Facebook may not be killing Google yet, but a large part of commerce lies with people buying what their friends bought--because their friends are trusted source

Facebook may not be killing Google yet, but a large part of commerce lies with people buying what their friends bought--because their friends are trusted sources, and to conform, and to chase the fashion of social status. Even if Facebook couldn't directly monetize those purchases, they could still take the potential ad. revenue for those product searches away from Google. And likely they could monetize these purchases via ads, because they know at least as much about you as Google. Finally, people don't go to Facebook to search on arbitrary queries (a la Google) yet, but they may start if the results are good enough. And they can be made quite good, because most people think like their friends, and so if you have the social graph you have a better PageRank then the generic Google rank. It will be full of selection bias, but to most people that's not a flaw--that's a feature.