SOCIAL NETWORK

Facebook: Facebook is an online social networking service. Facebook was founded on February 4, 2004 by Mark Zuckerberg with his college roommates and fellow Harvard University students. The founders had initially limited the website's membership to Harvard students, but later expanded it.  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.

Twitter: Twitter is an online social networking and microblogging service that enables users to send and read "tweets", which are text messages limited to 140 characters. Registered users can read and post tweets, but unregistered users can only read them. Twitter was created in March 2006 by Jack Dorsey and by July 2006, the site was launched. The service rapidly gained worldwide popularity, with 500 million registered users in 2012, who posted 340 million tweets per day. The service also handled 1.6 billion search queries per day. Twitter is now one of the ten most-visited websites, and has been described as "the SMS of theInternet.

Instagram: 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. Instagram was created by Kevin Systrom and Mike Krieger and launched in October 2010. The service rapidly gained popularity, with over 100 million active users as of April 2012. The service was acquired by Facebook in April 2012 for approximately US$1 billion in cash and stock. In 2013, Instagram grew by 23%, while Facebook, as the mother company, only grew by 3%.

Whats App: WhatsApp Messenger is a proprietary, cross-platform instant messaging subscription service for smartphones. 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. WhatsApp Inc. was founded in 2009 by Americans Brian Actonand Jan Koum (also the CEO), 

Snapchat: Snapchat is a photo messaging application developed by Evan Spiegel and Robert Murphy, then Stanford University students. Using the application, users can take photos, record videos, add text and drawings, and send them to a controlled list of recipients. These sent photographs and videos are known as "Snaps". Users set a time limit for how long recipients can view their Snaps (as of March 2014, the range is from 1 to 10 seconds), after which they will be hidden from the recipient's device and deleted from Snapchat's servers.