Instagram is an online photo-sharing and social networking service that enables its users to take pictures, apply digital filters to them, and share them on a variety of social networking services, such as media sites including Facebook or Twitter. 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 typically used by mobile device cameras.
Pinterest is a pinboard-style photo sharing website that allows users to create and manage theme-based image collections such as events, interests, hobbies, and more. Users can browse other pinboards for inspiration, ‘re-pin’ images to their own pinboards, or ‘like’ photos. The site was founded by Ben Silbermann, Paul Sciarra, and Evan Sharp, the site is managed by Cold Brew Labs and funded by a small group of entrepreneurs and inventors.
Bing (known previously as Live Search, Windows Live Search, and MSN Search) is a web search engine (advertised as a “decision engine”) from Microsoft. Bing was unveiled by Microsoft CEO Steve Ballmer on May 28, 2009 at the All Things Digital conference in San Diego for release on June 1.
Facebook is a social networking service launched in February 2004, owned and operated by Facebook, Inc. As of September 2012, Facebook has over one billion active users, more than half of whom use Facebook on a mobile device. Users must register before using the site, after which they may create a personal profile, add other users as friends, and exchange messages, including automatic notifications when they update their profile.