Facebook is going through a lot of mayhem right now with the surfacing of the news about privacy issues. To solve the problem, they are investigating all apps with suspicious activity, and will ban them from Facebook. In addition, you can also set the privacy in your settings for your apps and games.
Facebook announced that in mid-April of 2018 they will be adding a feature that allows you to see all the apps you have connected to your account, as well as all the sites you “liked.” You will then be able to undo those connections. Keep an eye out for that feature addition in your privacy settings.