What the forum FAQ says about floating coins:
Q: Coin Fountain: I see flying coins! What does that mean?
A: The coins are a random chance for players to win 100 coins while plowing, planting or harvesting. It happens completely randomly with any kind of crop. If you see the coin above your head, check your coin balance. You should have an additional 100 coins in there.
You do not need to click on the coin or grab it, the addition of the coins will be added automatically.
No, however you can buy farmville coins for cash.
Farmville coins are a crucial part of playing Farmville! You earn game coins by harvesting crops, animals, and tress. You also can claim game coins from your neighbors as rewards or earn them through other Farmville tasks. With these coins you can purchase items through the Farmville market for items you want or need to help you level up! Get as many coins as you can as that will make your experience as a Farmville farmer truly enhanced!
You can purchase items in the Marketplace with FarmVille coins. This includes animals, decorations, and expansions for your farm.
You buy it with Farmville coins.
You grow easy crops to get coins or you buy the crops that take a long time to come in because they are worth alot of coins or you can buy coins for farmville
80 coins!
No.
No.
You cannot transfer coins or FV cash used in Farmville.
The FarmVille snow leopard is available for 50,000 Coins.
You can harvest them and gain coins.
You cant.