Step1: click the "gear" button on the upper right portion of facebook and click on the Account Settings
Step2: click on the Apps in the menu at the right side
Step4: modify the "These people or lists" under the "Share this with" and select "Specific People or Lists" and add your buddies names on the text box below. These people will be the only ones who will receive all your farmville2 post. Click the Save Changes button.