As a result, this service is legal in the majority of the United States; whereas traditional gambling sites have been banned since 2006.

Another illegal gambling opportunity is offered by mobile gambling sites.

Of the 13 gambling sites raided, most were operated by the Gambino crime family, he said.

Betonline is the only gambling site for offer real money skill games to Americans.

It is also used in some gambling sites as a form of novelty betting.

The club opened in 1907 and is widely regarded as a classic gambling site.

Many online gambling sites offer "play money" games which can be played for freely-obtainable credits.

That would be at the price, however, of exposing many more consumers to unregulated gambling sites.

The media companies "are aiding and abetting in the promotion of these illegal gambling sites," she said.

Although revenues are small compared to those reaped by pure gambling sites, some in the industry believe that could change.