Burbank-based Warner Bros. said Monday that it is beginning to test renting movies via Facebook, using Facebook Credits, allowing consumers to watch movies directly from the social networking site. According to Warner, its first title is The Dark Knight, which it will be renting for 30 Facebook Credits, or $3. Warner said it plans to roll out additional titles in the testing of the effort. The studio said that users can watch titles in full screen, pause and resume the movie, and will have 48 hours from purchase to watch films. The company also is taking advantage of Facebook's features, allowing users to post comments on movies and connect with friends while watching the movie.