Twitter.com, Facebook.com and Linkedin.com Home Pages - Stock image
.com, Computer Monitor, Computer Mouse, Desktop PC, Internet
Milan, Italy- April 29, 2011: Twitter, Facebook and Linkedin home Pages on laptop screen. Twitter is a free social networking and microblogging service that gives users a personal web page up-dateable by text messages with a maximum length of 140 characters. Facebook is a social network service and website launched in February 2004 that is operated and privately owned by Facebook, Inc. Linkedin is a business-oriented social networking site. Founded in December 2002 and launched in May 2003, it is mainly used for professional networking.