Why Did Facebook Buy an e-Book Publisher?

Is Facebook about to get into the e-book business?

On Tuesday the social network announced that it was acquiring Push Pop Press, a digital book maker that specializes in interactive books for the Apple iPad and iPhone. The e-books built by the publisher feel like movies; interactive graphics with words sprinkled about cross the page.

Could we expect Facebook to start making and selling e-books on its Web site where it would go head-to-head with Apple, Amazon and Google?