Facebook has purchased digital bookmaker Push Pop Press, the companies announced today. Terms of the deal were not disclosed.

Push Pop Press made a name for itself by developing an iOS app version of former U.S. Vice President Al Gore's book "Our Choice." The application received widespread praise from critics and earned the company an Apple Design Award earlier this year.

But all that doesn't mean that Facebook will be getting into the digital-publishing business. According to Push Pop Press, Facebook is acquiring the company for its technology, which will be used in some way on the world's largest social network.

More: http://news.cnet.com/8301-13506_3-20087032-17/