[Top 10] Best Facebook Games to Kill Time

Do you get bored really easy? You should try playing one of these games, Millions of users play it every single day, For me this is one of the reason I keep coming back to facebook.
Here are the top facebook games popular around the world :

Rank	Game	Active Users	Developer
1	Cityville	95,025,706	Zyanga
2	Farmville	51,000,384	Zyanga
3	Texas Holdem Poker	38,161,049	Zyanga
4	FrontierVille	20,356,964	Zyanga
5	Café World	15,433,951	Zyanga
6	Mafia Wars Game	13,838,140	Zyanga
7	Millionaire City	12,166,847	Digital Chocoloate
8	Treasure Isle: The Adventure Game	11,814,102	Zyanga
9	Pet Society	11,266,231	Electronic Arts (EA)
10	Bejeweled Blitz	10,814,441	POPCAP Games