Legal Social Gambling in the US?
 

I have read that Chumba Casino is the only social casino to offer both a virtual and real money casino experience on a single platform, legally inside the US, via Sweepstakes. With its exclusive dual currency design, players can play for fun using the virtual gold coin currency or play for real money using ?Sweeps Cash?. Players can obtain ?Sweeps Cash? in numerous ways.

I had a look at it, it's based on a FB app, What do you think?

In New Jersey online gambling is legal, all the casinos are advertising it like crazy

On their affiliate program page it states

"Social is one of the fastest growing niches in both online and mobile gaming, and is completely legal across all 50 US states. Affiliates with US traffic will have numerous opportunities to work with brands that accept and convert US traffic."