Facebook API requires us to Use Strict Mode for Redirect URIs

I have a facebook app that we set up together that apparently is going to stop working unless I change a setting. I am not sure what it means but I did not yet change the setting to YES:

Will this break our site?:

Use Strict Mode for Redirect URIs
Only allow redirects that use the Facebook SDK or that exactly match the Valid OAuth Redirect URIs. Strongly recommended.

I believe this is for EasySocial login. I have not made the change yet.

Sean