The new Facebook Application platform seems to be the first stage in Facebooks assult on Google. Search can really be split into 2 groups, users searching for information that isn’t social and users searching for information that is social in nature. The top searches on google tend to be social networking, maps/directions, music, games, traveling, dating etc etc etc.
The biggest problem with Google is that Google doesn’t know how good or bad the destination site is. With facebook its directory lists social applications by the number of users they have, how popular they are etc. In effect Facebook is in the process of transforming into a portal/search engine.