The use of "Bot" programs or 3rd-party scripts that automatically perform actions on your computer, whether in a game or on a website, is strictly prohibited. Please readZynga's Terms of Service.
In addition to the possibility of having your account suspended, some Bot programs or scripts that you get from someone else can contain Trojans or Viruses. If you use or have used a Bot program in the past, you could find your password, User ID and other private information have been stolen.
So play fair and keep safe. Do not download or use Bots!