Instagram
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, such as Facebook, Twitter, Tumblr and Flickr. A distinctive feature is that it confines photos to a square shape, similar to Kodak Instamatic and Polaroid images, in contrast to the 16:9 aspect ratio now typically used by mobile device cameras.

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. Instagram is distributed through the Apple App Store and Google Play. Support was originally available for only the iPhone, iPad, and iPod Touch; in April 2012, support was added for Android Camera phones running 2.2 Froyo. Originally a purely photo-sharing service, Instagram incorporated video-sharing in June 2013, allowing its users to record and share videos lasting for up to 15 seconds. This venture has been seen by some as Facebook's attempt at completing with Twitter's Vine video-sharing application.
Reference
Wikipedia
Social Networking
Facebook
flickr
foursquare
Google+
Instagram
LinkedIn
myspace
Pinterest
tumblr
twitter