We spotted the groundwork for a new "app invite" system when Cody Toombs checked out some of the hidden code in Google Play Services back in April. In a detailed post-Google I/O story on some of the new features in version 7.5, Google Developer Advocate Ian Lake made the feature official. App Invites, basically a method by which developers can directly advertise apps and give users rewards for installing them, are coming soon (if they aren't available to developers already).

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