Facebook
A January 2009 Compete.com study ranked Facebook as the most used social networking service by worldwide monthly active users. Entertainment Weekly put the site on its end-of-the-decade "best-of" list. It said, "How on earth did we stalk our exes, remember our co-workers birthdays, bug our friends, and play a rousing game of Scrabulous before Facebook?" Quantcast estimates Facebook had 138.9 million monthly different U.S. visitors in May 2011. According to Social Media Today, in April 2010 about 41.6% of the U.S. population had a Facebook account. Facebook's growth started to slow down in some areas. The site lost 7 million active users in the United States and Canada in May 2011 relative to previous statistics.