Since online gambling is illegal in the US, you may get push-back from Facebook even though you seem to only be emulating gambling. You're also using the word

Since online gambling is illegal in the US, you may get push-back from Facebook even though you seem to only be emulating gambling. You're also using the word "Bet" which may cause companies like Facebook and Google to censor you in areas like AdWords, Apps, etc. If it was me and I wasn't based in the USA, I might create a standalone gambling site. US companies can't compete with you right now. Mark Shuttleworth figured out that US companies couldn't sell strong SSL certs to companies outside the USA thanks to ITAR regulations. So he created Thawte in South Africa and sold strong certs from there. Verisign bought the company for around $700 million. He used that money to create Ubuntu. Best of luck!!