It was probably only a matter of time... Facebook beat out Google in 2010 as the most visited site of the year.  This is the first time since Google's inception that it wasn't the top visited website.The Los Angeles Times reported that:

It was Facebook's first time in the top spot, according to Hitwise. The social networking site got 8.93% of all U.S. visits between January and November 2010, while Google came in second with 7.19%, followed by Yahoo Mail and YouTube.

Some other fun facts of note from the article:

"Facebook" was also the most-searched term for the second year in a row, followed by "facebook login" and "youtube." The analysis also found that Kim Kardashian was the top-searched person, "Star Wars" the top movie search, and Lady Gaga the top music search. And, in a less-than-stellar sign for the real estate market, "houses for rent" and "homes for rent" topped combined searches for "houses for sale" and "homes for sale."

Well it is good to know that Kim Kardashian was the top searched for person... makes me smile :)