You can also turn off wall posts directly from your Facebook Settings.
1. Go to the little down arrow next to the lock icon in your Facebook toolbar
2. Click on Settings
2.a. Click on Apps
3. Choose the Facebook App that you don't want posting to your or your friends wall
4. Click on the App or click the pencil icon to edit
5. Choose the groups, friends, and places that you'd like to share or not share that applications posts
6. Click the 'Save' button