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is an online social networking service. Its name comes from a colloquialism for the directory given to students at some American universities. Facebook was founded on February 4, 2004 by Mark Zuckerberg with his college roommates and fellow Harvard University students Eduardo Saverin, Andrew McCollum, Dustin Moskovitz and Chris Hughes.
The founders had initially limited the website's membership to Harvard students, but later expanded it to colleges in the Boston area, the Ivy League, and Stanford University. It gradually added support for students at various other universities before it opened to high-school students, and eventually to anyone aged 13 and over. Facebook now allows anyone who claims to be at least 13 years old to become a registered user of the website

read more : http://en.wikipedia.org/wiki/Facebook



Istagram

Instagram is an online photo-sharing, video-sharing and social networking service that enables its users to take pictures and videos, apply digital filters to them, and share them on a variety of social networking services, such as Facebook, Twitter, Tumblr and Flickr.[7] A distinctive feature is that it confines photos to a square shape, similar to Kodak Instamatic and Polaroid images, in contrast to the 4:3 aspect ratio typically used by mobile device cameras. Users are also able to record and share short videos lasting for up to 15 seconds
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Twitter

Twitter is an online social networking and microblogging service that enables users to send and read short 140-character text messages, called "tweets". Registered users can read and post tweets, but unregistered users can only read them. Users access Twitter through the website interface, SMS, or mobile device app.[10] Twitter Inc. is based in San Francisco and has offices in New York City, Boston, San Antonio and Detroit

read more :en.wikipedia.org/wiki/Twitter


WhatsApp

WhatsApp Messenger is a proprietary, cross-platform instant messaging subscription service for smartphones that uses the internet for communication. In addition to text messaging, users can send each other images, video, and audio media messages as well as their location using integrated mapping features. The client software is available for Google Android, BlackBerry OS, Apple iOS, selected Nokia Series 40, Symbian, selected Nokia Asha platform, Microsoft Windows Phone and BlackBerry 10. WhatsApp Inc. was founded in 2009 by US Citizens Brian Acton and Jan Koum (also the CEO), both former employees of Yahoo!, and is based in Mountain View, California.[1][2] The company employs 55 people

read more :http://en.wikipedia.org/wiki/WhatsApp


Line

Line is a South Korean-Japanese proprietary application for instant messaging on smartphones and personal computers. Line users exchange text messages, graphics, video and audio media, make free VoIP calls, and hold free audio or video conferences. Line, launched in Japan in 2011, reached 100 million users within eighteen months and 200 million users only six months later.[1] Line became Japan's largest social network in 2013; on 25 November 2013, it announced that it had 300 million registrants worldwide, of which 50 million users are within Japan


read more : http://en.wikipedia.org/wiki/Line_(application)