If you've had a Facebook account for any length of time, you've likely allowed a long list of companies to access your profile via an app or by using Facebook to sign up for another online service or account. Granting permission to access your profile isn't limited to when you use their app or service as once it's granted, they have access until you revoke it. A regular maintenance tip we suggest you execute on Facebook is a review of the apps and websites that have access to your profile at least every couple of months. You can do this by accessing the 'Apps and Websites' section in the Settings menu of your Facebook account. For the step-by-step instructions for doing this, visit this Facebook help page:and#160;https://www.facebook.com/help/170585223002660