Instagram

Founded by Kevin Systrom and Mike Krieger in October 2010, Instagram is an online mobile photo-sharing, video-sharing and social networking service used on a variety of social networking services, including Facebook, Twitter, Tumblr and Flickr. Instagram also offers a variety of digital filters for users to apply to their images.

Facebook acquired Instagram in April 2012, by which time there were more than 30 million Instagram accounts worldwide.