Yes, it is. Unless you buy CityVille Cash.
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Go up to "Account" in the corner of your Facebook screen. Click on "Privacy Settings." At the bottom of the screen you will see "Apps and Websites." Click on the "Edit Settings" there. Select Cityville, then click "Remove App." It should delete everything on Cityville.
Search 'Cityville' in the search bar at the top of the Facebook page. Alternatively, go on a different Zynga game (most end with the suffix ville, e.g. Farmville, Fishville etc) and it should come up above the game - advertising other Zynga games. It should be there.
Its really hard to get free credits on Facebook. However you can join sites like Swagbucks.
no its free
I use my iPod, and I do not have a Facebook. It is a free app, and you can use your smartphone as well.