A joint press release from Facebook and Farmville creator Zynga has announced that the two have entered into a "five-year strategic relationship," which "increases their shared commitment to social gaming on Facebook and expands use of Facebook Credits in Zynga's games." The new union likely comes as a response to reports that Zynga CEO Mark Pincus was considering leaving Facebook behind to start a new social gaming hub.

The terms of the relationship aren't being discussed, but we imagine a new agreement was reached regarding how much Facebook takes from purchases using the aforementioned Credits. We're likely to hear more about the specifics of this agreement in the coming weeks.