App of the day is under the red "earn coins" tab at the top of the game. You basically just install a facebook application and 15 minutes later you get a few FarmCash in the game, and then you can remove the app.
They have a new one everyday, but if you do it often then they stop having them so frequently for you. I'd say you can only get about 20FC out of the app of the day before they effectively cut you off.
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Level 140 
Farming since July 2009 and haven't bought FC yet!
Visit my farms: 1, 2, 3, 4, 5, 6 and 7!
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