Play poker on Facebook with your friends or with any number of other Facebook poker enthusiasts with these apps!
According to their data, "over 37 million people play Zynga Poker each month." This is the most popular free poker app on Facebook -- which as of now has nearly 38 million people claiming to "like" it. The app also can be played on iPhones and Android phones. It is a bit cluttered with ads and things, but it is super easy to play and get started and has a helpful bar at the bottom which tells you what your hand is. You can even turn on a "hand strength" meter to let you know how good your hand is in general
With under 1,000,000 users, this poker app has far fewer players than the Zynga app, but that may not be a bad thing. The smaller pool results in a slightly better group of players, and you can play to win chances to win a real shot at a World Series of Poker seat.
WPT recently re-did a lot of their app and they hope to catch up to the WSOP in users soon. As you climb up in ranks, you unlock new tables to play at which can only be visited by players with big bankrolls.