Instagram is a free photo sharing program launched in October 2010 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.
In its largest acquisition deal up to date, Facebook acquired Instagram (with its 13 employees) for approximately $1 billion in cash and stock in April 2012, with plans to keep it independently managed.