Facebook

facebook.com

Facebook is a social networking website with more than 845 million active users in February 2012, which is about one person for every eight in the world. 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".