what is your favorite facebook application and how often do you use it?

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mine would be the game baking life. it's not necessarily my favorite application, i guess, since i'm getting pretty tired of it but i don't play any other games anymore. before, when i was totally addicted to it. i have to log on every time my new pastry would be cooked. but now that i am pretty much over it, i just let them burn when i'm too lazy to go online by the time it finishes cooking. how bout you, do you have a favorite facebook application?