“The Dark Knight” may be a few years old now, but it’s getting new life as the first title offered up for rent through a partnership between Warner Bros. and Facebook. For 30 Facebook credits, which converts to about $3, you can watch the movie in your browser. Warner Bros. plans to expand the titles available for rent and purchase in the coming months.

There are a couple catches. For one, the offer isn’t valid in all states. Second, to watch the movie, users have to essentially allow the video platform for “The Dark Knight” application permissions to your account just like any other app. If you don’t allow the app access to your information, which includes your demographics, list of friends and any shared information, you can’t watch the movie.

Agreeing to grant those permissions gives you access to the movie for 48 hours, during which you can play and pause and, of course, keep sharing and posting to Facebook.

(Post Co. Chairman and Chief Executive Donald E. Graham sits on Facebook’s board of directors, and the newspaper and many Post staffers use Facebook for marketing purposes.)

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