Google+ is continuing to press its challenge of Facebook's social-network supremacy by adding a gaming component -- a significant moneymaker for Facebook -- and tapping the expertise of such developers as Zynga and Rovio. Facebook is taking countermeasures, recently unveiling plans for new features designed to make gaming on its site more exciting and also announcing a new policy that will give developers more leeway in how they can promote their games on the social site.

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