Blackjack online

[Blake Lovely]

I was reading about some of the bonuses some of the online blackjack sites offer, and several players were explaing that BJ is positive EV with the bonus.

How do online sites prevent card counting? Do they run an imaginary 6 deck shoe, or is every hand completely random, and has anyone done any studies?

thanks alot
blake

[imitation]

New shuffle every hand.