P-Kama, an Israeli company recently debuted Rummikub for Facebook app, which can also be played right on Rummikub.com thanks to Facebook Connect. Rummikub is a multiplayer game whose objective is to create either a sets three tiles bearing the same figure in different colors, or sets of runs—three consecutive numbers in the same color. The first player to place all the tiles on their rack on the table wins.
In Rummikub's online version, game play takes place in both private and public rooms that accommodate up to four players at a time. Extra bells and whistles include video chat and throwing of tomatoes at slow-playing opponents. Unsurprisingly, Rummikub is running a virtual goods ecosystem based on "Joker Credits" as currency. The credits can be used to purchase entry to tournaments, as well as gifts and room themes. For e.g., gifts players can send each other during a game cost 1-3 Joker Credits, room themes can cost up to 20. Pricing is tiered, where 50 credits will run you $5, 150 credits will cost $10, and so on.
More Info: Rummikub for Facebook app