Some big sites are getting big traffic, but it's not from the usual suspect of Google. Instead, it's from Facebook. PerezHilton.com and Cafemom.com are among the sites benefitting from the word of mouth and social networking going on at Facebook.
Interestingly enough, there is one more site benefitting from Facebook traffic: Twitter, whose buzz as of late seems a bit of a threat to both Facebook and Google. The threat is less for Facebook, who benefits from user mashups allowing status updates to appear on Twitter and vice versa.
Facebook sees about 1/3 of the U.S. traffic that Google does. So, it's surprising to see this trend happen so soon.