A good practice with Freebies on Facebook is to remove apps after signing up. Whenever you sign up for something and need to click "Allow" to let it access your profile, you can remove the app on Facebook. It's not necessary to remove every app, but it's a really good idea if you're ever in doubt or something looks even mildly suspicious.
How to Remove a Facebook Application:Easy method:
Click link https://www.facebook.com/settings?tab=applications
and click X on far right of app you want to removeStep-by-step method:
1. Go to your home page on Facebook http://facebook.com
2. in left hand column (under "ads and pages") click the application you want to remove
3. At the bottom left hand side of page click REMOVE APPLICATION. If you don't have Remove Application as an option, then click "Unlike" first, then click Remove Application.
Alternately, you can Click "Account" in upper right corner of Facebook page, then click "Application Settings" and remove (click X next to) any you don't want. You can also change the "Show" category drop-down box if you want to see other options of types of apps to remove.