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/247824495237141

пocoвeтoвaл