Users must register before using the site, after which they may create a personal profile, add other users as friends, and exchange messages, including automatic notifications when they update their profile. Additionally, users may join common-interest user groups, organized by workplace, school or college, or other characteristics, and categorize their friends into lists such as "People From Work" or "Close Friends". As of September 2012, Facebook has over one billion active users,[10] of which 8.7% are fake.[11] According to a May 2011 Consumer Reports survey, there are 7.5 million children under 13 with accounts and 5 million under 10, violating the site's terms of service.[12]
In May 2005, Accel partners invested $12.7 million in Facebook, and Jim Breyer[13] added $1 million of his own money to the pot. A January 2009 Compete.com study ranked Facebook as the most used social networking service by worldwide monthly active users.[14] Entertainment Weekly included the site on its end-of-the-decade "best-of" list, saying, "How on earth did we stalk our exes, remember our