Warner Bros. is turning to Facebook , where it hopes to find an electronic audience interested in digitally renting The Dark Knight . Warners said Monday that it is the first Hollywood studio to offer movies directly on Facebook. Friends of Christopher Nolan's Knight, the second of his two Batman movies, can rent the film by going to its official Facebook page and clicking a "rent" icon to apply Facebook Credits. The cost per rental is 30 Facebook Credits, or $3. Viewers will have 48 hours from the purchase to watch the movie, which can be viewed full screen and also paused and resumed within that period. While watching the movie, consumers will also have full Facebook functionality, including the ability to post comments, interact with friends and update their status. "Facebook has become a daily destination for hundreds of millions of people," said Thomas Gewecke, president of Warner Bros. Digital Distribution. "Making our films available through