Both PokerStars and 888poker offer real money games so - yes, you can play online poker for money with your friends. However, this option might not be available if real money poker games online are not legal in your country or state.

You can win real money in cash games and tournaments\n\n Although many people play poker for the joy of doing so, even more play real money poker at PokerStars to win more money!

Since then, several states have created gambling rules that allow some operators (including PokerStars) to offer real money poker games online to US players.