Internet users spent the last year searching for information on Facebook, according to Experian Hitwise. The research firm reports the word "Facebook" as the Web's most popular search term, accounting for 3.1% of all searches. Add in related query terms and the social network accounted for four of the year’s Top 10 searches. New terms also entered the fray -- terms like addicting games, amazon.com, cnn, chase online, hotmail, and Twitter. Hitwise also provides a list of the most-visited Web sites in 2011.