Social networks.

Facebook.

Facebook is a social networking service launched in February 2004, owned and operated by Facebook,Inc.As of September 2012, Facebook has over one billion active users, more than half of whom use Facebook on a mobile device.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".

Twitter is an online social networking service that enables its users to send and read text-based messages known as "tweets". Many celebreties use twitter.

What is “Twitter”?

The original logo, used from 15 July 2006 until 14 September 2010.

Twitter’s official logos

The second logo, used from 14 September 2010 until 5 June 2012.

The third and current logo, used since 5 June 2012.

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Skype was first released in 2003 written by Estonian developersAhti Heinla, Priit Kasesalu, andJaan Tallinn, who had alsooriginally developed Kazaa.[12] Itdeveloped into a platform withover 600 million users and wasbought by Microsoft in 2011 for$8.5 billion.

MySpace is a popular social networking website offering an interactive, user-submitted network of

friends, personal profiles, blogs, groups, photos, music and videos internationally. It is

headquartered in Beverly Hills, California, US, where it shares an office building with its immediate

owner, Fox Interactive Media; in turn, the owner of Fox Interactive and therefore MySpace, News

Corporation, is headquartered in New York City.

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