How to Delete Farmville from your Facebook Applicationsby Nick Peers
If you no longer play Farmville and want to stop the app from posting on your Timeline and displaying notifications, delete it from your Facebook account. You can opt to remove all your Farmville activity from Facebook when you remove the app from your applications list. If you wish to play the game again in the future, you will need to reinstall the app. If you just want to prevent the game from posting on your Timeline and displaying notifications, you can do so without deleting the app.
Delete the Farmville App
Click the arrowhead in the top right corner of the Facebook page and choose "Settings" from the menu to open the General Account Settings page. Click the "Apps" link and then the "Show all" link to view all apps installed on your Facebook account. Mouse over the "Farmville" app and click the "X" icon. To remove all your Farmville activity from Facebook, check the "Delete all your FarmVille activity on Facebook" box. Click "Remove" to remove the app.
Stop Farmville Posts and Notifications
You can prevent the game from posting on your Timeline and displaying notifications without deleting it. Open the App Settings page, mouse over the "Farmville" app and click the pencil icon. Uncheck the "Post" box to prevent the app from posting on your behalf. Choose "No" from the "Send you notifications" box to prevent Farmville from sending you notifications. Click "Save" to apply the new settings.