Shazam is extending its second-screen TV companion app to all programs on U.S. airwaves, enabling mobile device users to access cast and guest star bios, Hollywood gossip, trivia and related information, as well as comment on the show via Facebook, Twitter and Google+ (NASDAQ:GOOG).

The free Shazam application identifies music, broadcast media and advertising. Users hold their handset to the audio feed, and the app captures a clip that is run through the company's database to find an exact match, delivering information and interactive experiences around the content in question. U.S. users can now tag any television show they're watching regardless of network, time of day or programming category--for scripted programs, Shazam will list the featured cast members, complete with links to information sites like IMDb and Wikipedia, and for live sports, the app will deliver stats, scores and schedules. Users may also see what shows their Facebook friends are tagging and comment on those tags directly within the Shazam app.

Shazam previously developed customized second-screen promotions around programming including the Super Bowl, the Grammy Awards and American Idol. "According to industry studies, 86 percent of smartphone owners use their mobile device while watching TV and, with our expansion into television, we've seen a surge of activity due to recent Shazam-enabled events such as NBC's Olympic broadcast, where more than one million people tagged the closing ceremony, as well as the U.S. Open tennis grand slam event on CBS earlier this month," said Shazam CEO Andrew Fisher.