Facebook - Avoid downloads that offer to customize your Facebook profile
Please avoid suspicious downloads or email messages that might offer a customizable profile setting. Instead lock down your privacy and security settings directly within Facebook, as well as selecting other preferable settings
Facebook - Avoid downloads that offer to customize your Facebook profile
http://www.facebook.com/security
QUOTE: Take care when downloading programs or browser extensions that offer to “customize” your Facebook Profile. These products are not built or sanctioned by Facebook and may leave you vulnerable to security threats.