Social TV apps

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iPhone/Android SDK

TvTak Software Development Kit The TvTak iPhone/Android Software Development Kit allows third-party developers, advertisers and media companies to enable instant TV check-ins on their TV Companion Apps, bookmarking TV content and triggering events in synch with the TV broadcast. http://www.tvtak.com/developers.html#iPhone_SDK

Apps Let You Supplement the TV Show You’re Watching

http://www.nytimes.com/2012/03/04/business/apps-let-you-supplement-the-tv-show-youre-watching.html Darren Hauck for The New York Times
IntoNow allows you to synchronize instantly with whatever you're watching – with just the touch of a button, IntoNow recognizes what you're watching, whether live or recorded, and unlocks a great experience. We are excited to announce IntoNow 2.0 for Android. What is new, you ask?

IntoNow - Android Apps on Google Play

https://play.google.com/store/apps/details?id=com.intonow&hl=en