If there’s one thing that makes Facebook popular, it would be social gaming. This billion dollar industry is one of the reasons why Google invested $100 million in Zynga. And now with its own social networking space, Google will eventually offer social gaming to Google+.

Slashgear earlier reported that they spotted on Google help pages mentioning something about “Games stream,” an indication that Google is working on a social gaming feature on Google+. Although Google pulled the reference afterward.

Google’s help pages for Google+ have officially confirmed the upcoming Games Stream, a place where results from what will presumably be social-style gaming on the new network will be pulled together. ”If you’re looking for updates shared from games, check out your Games stream” the help article suggests, though currently the link it mentions leads to a 404 page.

The report is an indication that the social gaming feature on Google+ is something to watch out for. In the spirit of Circles, one of the social network’s unique features that allows users to organize their connections, the Games stream will have its own “stream.” The so called dedicated stream will eliminate having to deal with sometimes annoying notifications that comes in playing social games.  It will be interesting to see how the games will work with Circles.

Not enough details is yet known about the social gaming feature on Google+, but Vic Gundotra, Google’s senior vice-president of social, already confirmed that they are going to release a developer API for the new social network. Google’s “social gaming team” was already in talks with some game developers.

Once this gaming feature arrives on Google+, the real battle for the social networking space domination between Google and Facebook officially starts.