The social video game PetVille on Facebook allows you to create and take care of a virtual pet. One aspect of the game is adding neighbors, which allows you to earn coins and other prizes that you can use in the game. You may find that some of your neighbors no longer play the game and you want to delete them to better organize your list of friends. You can delete friends from PetVille through the user interface.
Instructions:
1)Type "PetVille" into the search bar at the top of the Facebook screen and press "Enter." The game opens on the screen with a row of tabs above the main screen.
2)Click the "Neighbors" tab and scroll down to see your list of friends. Each of your friends is listed in a box with the word "Neighbor" in it.
3)Click the "Remove as neighbor" button to the right of "Neighbor" in the box of the friend you want to remove. The screen reloads, the box turns green and "Let's Be Neighbors" appears in place of "Neighbors."
Source: eHow