Also interested in the legal aspect of gambling:
"Gambling Applications:
Developers may operate a "For Fun" App displaying a gambling brand as long as:
It is clear through either the branding (e.g., “[insert name of gambling company] For Fun”) or the name of the App (“[insert name of gambling company] Free Poker”) that the App is a “for fun only” game.
The App does not link in any way to a gambling site.
Earnings within the App can’t be cashed out in any way, including being converted into credit that may be used to gamble online or at a casino".
https://www.facebook.com/help/mobile-touch/247824495237141пocoвeтoвaл

ah i thought that was there i couldnt find it tnx.
Also If u buy the coins in the game u would have to pay 30% to facebook , with coins on the exchanges they wouldnt be able to take their 30% i wonder how thats dealt with.(zenga pays 30%)
@mc have u looked into ANY of this ?