For turning live TV-watching into a social media appointment with friends and fellow fans. "If you're watching TV, chances are you're using social media, too," says CEO Alex Iskold. "We're tapping into that market." GetGlue offers its users three main services: the ability to check in to a TV show, interaction with others watching too, and special loyalty features like retail rewards and profile badges. Last year, its monthly check-ins increased 1,000%, to more than 16 million per month by year's end. GetGlue has partnerships with more than 70 media companies, including virtually all of the major TV networks. And some, like TNT, have even integrated GetGlue into their own mobile apps. Last year it refined its filters to direct users toward conversations they're most interested in, based on their TV preferences.