There are a lot of games on Facebook which can be played for free. And a lot of them can be very exciting. However, everything depends on what type of game you want to play.
If you are into Role-Playing Games (RPG) then the best game to look for is Mafia Wars. Mafia Wars allows you to create your very own gang and even fight the members of other gangs. If you do not like violence or crime games, you can try the ones which even young kids can play.
There's Farm Town, Frontierville and Farmville. These games allow you to maintain your very own virtual farm and interact with other farm owners. If you want to build and maintain neighborhoods and cities, you can choose to play Yoville and Cityville.
This game also allows you to design cities and make them become huge and powerful. There are also other games which allow you to keep a restaurant like Restaurant City and pets like Pet Society. If you are into old school games, you can pick the games offered by MindJolt.
You can choose Arcade, Puzzle, and Sports games like the popular Brick game, and Bejeweled. Source: http://www.socialtimes.com/2009/07/list-of-best-facebook-games.
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