Excerpt from a Google/Facebook competitive snapshot
And as Facebook gains in popularity, it grows as a threat. Google sites, including the search engine and YouTube, get more unique visitors than Facebook. But in August, for the first time, people spent more time on Facebook than on Google sites, according to comScore, the Web analytics firm.
Some people are beginning to turn to their friends on Facebook for information for which they had used Google, like asking for recommendations on the best sushi or baby sitter.