Tbh, they're all the same, facebook uses Iphone server, so updates apply to all pretty much, guess it's a push to use them interchangably 
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So the theory goes like this: use your current players to increase your player count on FB. I'm guessing because people on facebook won't start playing era by themselves... Increase the games statistics on facebook and that will attract actual new players overall? What mad scientist cooked this one up? Snk?