Mobile multiplayer games: Own XMPP server vs PubNub/Google App Engine etc

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http://stackoverflow.com – I'm evaluating the best server-side options for turn-based mobile games that work in near real-time. Presuming the authoritative game server which matches users and creates channels is already there, what would be the best solution for inter-player communication? In my case, it's always 2-8 players on one channel and during the game, they only need to communicate between each other. So if one player makes a move, all other players on their channel must be notified about that move. Solution A: PubNub First, I took a look at PubNub, which offers a product called "Galaxy", and that seems to be (HowTos)