Interactive media refers to digital computer-based systems that respond to user actions by presenting content like text, graphics, animation, video, audio, and games. Interactive social media has grown into a multi-billion pound industry annually that employs over 34,000 people and has over 1.1 billion people on Facebook. Major companies in interactive media include Facebook, which was founded by Mark Zuckerberg and went public in 2012, and Twitter, which was created by Jack Dorsey and is privately owned.