I would love to see if Facebook could create a better search engine by using an individual's social network to weight links instead of backlinks. It might be t

I would love to see if Facebook could create a better search engine by using an individual's social network to weight links instead of backlinks. It might be too much work just to see if it is useful but I'm thinking they have a ton of data about where everyone goes on the web because the Like button is so pervasive. Why not use that data to make search extremely personalized? Reasons why I like this: 1) It's not like anyone currently uses facebook for search, they literally have nothing to lose. 2) It would be interesting to see if the aphorism, "Show me your friends and I'll show you your future" holds up. 3) It's data that google doesn't have access to, unless G+ takes off. 4) It would be cheaper to crawl the web, essentially your users are your web crawlers. Take the same graph theory algorithms used for backlinks and apply it to views and instead of page rank use time that their friends spend on the site. Then you can do some interesting stuff like weight the page rank more heavily for individuals you interact with more. Or super creepy (but statistically interesting) stuff could be done like if you want someone to reconnect with a friend they haven't spoken to in a while, weight the "long lost friend's" pages more heavily. Essentially, influence people to talk to each other by converging their data about the world. EDIT: Another thought - if websites know that they're only admission into the search engine is putting a Like button on their page it gives them an incentive to do so.