Instagram - fast, beautiful and fun way to share your photos with friends and family - it’s free.

Snap a picture, choose a filter to transform its look and feel, then post to Instagram. Share to Facebook, Twitter, and Tumblr too – it's as easy as pie. It's photo sharing, reinvented.

 

as per wikipedia - Instagram is a free photo sharing application that allows users to take a photo, apply a digital filter to it, and then share it on a variety of social networking services, including Instagram's own. A distinctive feature 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.

Instagram was initially supported on iPhone, iPad, and iPod Touch; in April 2012, the company added support for Android camera phones running 2.2 (Froyo) or higher. It is distributed via the iTunes App Store and Google Play.

On April 9, 2012, Facebook announced it would acquire the company (and its 14 employees) for approximately $1 billion in cash and stock, with plans to keep it independently managed.

 

By December 2010, Instagram had one million registered users. In June 2011 Instagram announced five million users, passing ten million in September the same year.Instagram announced that 100 million photos had been uploaded to its service as of July 2011. The total reached 150 million in August. In April 2012, it was announced that over 30 million accounts were set up on Instagram.

Instagram's new Android version in Google Play crossed more than one million downloads within 12 hours.

On April 3, 2012, Instagram for was released. That same week, Instagram raised $50 million from venture capitalists for a share of the company that valued it at $500 million. On April 9th, it was announced that Instagram would be acquired by Facebook for approximately $1 billion in cash and stock. The deal, which was made just before Facebook was scheduled to go public, cost Facebook about a quarter of the cash-on-hand they had as of the end of 2011; the deal was for a company characterized as having "lots of buzz but no business model" and the price was contrasted with the $35 million Yahoo! paid for Flickr in 2007,a website which has since become among the 50 most popular in the world. Mark Zuckerberg noted that Facebook was "committed to building and growing Instagram independently", in contrast to its common practice of, as CNNMoney.com put it, buying "hot startups, kill[ing] their products, and redeploy[ing] their staff on other projects. source-wikipedia