zeebox has launched in the US with unprecedented support from some of the country's biggest broadcasters. Comcast Cable, Cinemax, NBCUniversal and HBO have all endorsed the TV viewing companion app which is available on iOS, Android and online from launch. The partners have pumped financial and, essentially,  promotional support, allowing zeebox to cover more than 30 networks right away.

The news comes just days after the technology was finally integrated into the Sky+ app. Originally launched in October 2011, BSkyB bought a stake in the technology at the beginning of this year, indicating the broadcasters interest in the second screen experience.

zeebox's consumer research confirms that up to 70% of U.S. television viewers are interested in the unique feature set that zeebox provides.

"We are proud to launch with this game-changing roster of partners who recognize the importance of fully meeting web-empowered consumer expectations," said Ernesto Schmitt, CEO and co-founder of zeebox.

"As consumers continue to flock to social media and the web to experience a program beyond what is on the screen, zeebox gives content owners and programmers a direct line of communication, feedback and engagement that has never before been possible."

As well as bringing a customized TV guide, live chat, social network sharing features to the TV experience, Comcast's involvement may see the app become a remote control for the cable operator's devices which would provide a distinct advantage over competition

"We're excited to team with zeebox on their US launch", said Steve Burke, CEO of NBCUniversal. "As the Olympics demonstrated, the second screen experience has become an increasingly important platform to engage audiences. We think the zeebox technology presents tremendous opportunities for our viewers and our advertisers".