CBS already owned a 50% stake in TV Guide Digital. They have now acquired the remaining stake from their joint venture partner Lionsgate.
TV Guide Digital offer television guide and alert services through mobile apps and their website TVGuide.com.
CBS already owns TV.com and loads of similar web properties. The company has been making acquisitions in the recent times to boost their online and mobile portfolio. Some of their other offerings are GameSpot, Last.fm, Metacritic and Chow.