Justin.tv is a website created by Justin Kan, Emmett Shear, Michael Seibel and Kyle Vogt in 2007 that allows anyone to broadcast video online. Justin.tv user accounts are called “channels”, like those on YouTube, and users are encouraged to broadcast a wide variety of user-generated live video content, called “broadcasts”.
The company is an Internet startup based in San Francisco, California, with seed funding from Paul Graham of seed capital firm Y Combinator and Series A funding with Alsop Louie Partners and Draper Associates. Users are permitted to broadcast to an unlimited number of people for free, and watching broadcasts does not require user registration. Broadcasts that are considered to contain potentially offensive content are available only to registered users over the age of 18. Broadcasts containing defamation, pornography, copyright violations, or encouraging criminal conduct are prohibited by Justin.tv’s terms of service.
On February 10, 2014, Twitch.tv’s and Justin.tv’s parent company was rebranded as Twitch Interactive. Wikipedia