The two-player word game, similar to Scrabble, is the San Francisco company's first application to transition from smartphones to Facebook. It is now available at http://apps.facebook.com/wordswithfriends.
Zynga acquired the game, along with creator Newtoys, in December 2010.
Zynga announced plans to transition the game earlier this week, but did not give an official launch date at the time.
Users will be able to transfer matches from their Apple (AAPL) iOS or Android app to the Facebook game, Zynga announced. The Facebook platform will integrate additional social features, such as "brag feeds," which will post boasts of superiority on a friend's wall after a win.
Zynga has a dozen games available on mobile platforms, according to the release, but has previously only transitioned games from Facebook to smartphones.
Contact Jeremy C. Owens at 408-920-5876; follow him at Twitter.com/mercbizbreak.