Jul 19, 2011 10:41 GMT  ·  By

Zynga has updated its Securities and Exchange Commission filing with a lot of details on its investors and its deal with Facebook. The deal is interesting since it's anything but standard. Of course, as the biggest developer on the Facebook platform, it's a given that it gets a custom deal.

Zynga is heavily dependent on Facebook. For a long time, the relationship between the two companies was tense. They both needed each other, but they both wanted to profit from it.

In the end, thanks to details revealed in the addendum, the two ended up with a pretty strong deal.

Facebook is guaranteed exclusivity for any Zynga game that uses its platform. Zynga can run the games elsewhere, but they have to use Facebook logins.

Facebook also gets 30 percent of all virtual currency transactions in the games, which are all done with Credits, this was the main point of the deal.

In fact, Facebook made about $84 million from Credits used in Zynga games in the first quarter of the year alone, the new filing also revealed.

So far, Facebook seems to be getting the better end of the deal. But Zynga has several advantages as well. For one, it gets a cut of the advertising revenue for ads ran next to its games on Facebook. The exact revenue split is unknown since big parts of the contract, published in the filing were redacted.

UPDATE: Facebook doesn't share the revenue from ads running next to Zynga games, rather the deal covers ads, powered by Facebook, ran on other properties than the social network. The two companies haven't started doing this and there is no clear schedule yet.

What's more, Facebook has to help Zynga meet several growth targets for games part of the deal. Again, the exact numbers are unknown, but whatever Facebook is doing, it's working since Zynga launches break record after record.

At the time of the deal, game exclusivity included titles such as PetVille, FishVille, Treasure Isle, Café World, Mafia Wars, YoVille, Live Poker by Zynga and FarmVille.

You'll recognize some of Zynga's biggest tiles in the list. But Facebook also gets exclusivity for newer titles, its latest hits such as CityVille and the new Empires & Allies are included in the deal.