How to turn off "Use Strict Mode for Redirect URIs" in facebook app

Is there any way to turn off the option Use Strict Mode for Redirect URIs in a Facebook app?

NO

Due to the security changes made to Facebook, it's no longer possible to turn off this setting.

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Regarding specifics of Sitecore and the Social Connected module, I found from @CBroe's comments that the Valid OAuth Redirect URIs now needs to contain a query string parameter as follows:

http://example.com/layouts/Social/Connector/SocialLogin.ashx?type=access

previously I just had

http://example.com/layouts/Social/Connector/SocialLogin.ashx

If you are using HTTPS, you will need to enter the URI with the port number as well i.e.

https://example.com:443/layouts/Social/Connector/SocialLogin.ashx?type=access

This last point is not related to the recent Facebook app changes.

Same experience, I could not turn it off. What eventually worked for me was

I have a link on my site that starts the login process:

https://www.example.com/users/auth/facebook

Following this causes my rails app to redirect to

https://www.facebook.com/v2.6/dialog/oauth?client_id=1234&redirect_uri=https%3A%2F%2Fwww.example.com%2Fusers%2Fauth%2Ffacebook%2Fcallback&response_type=code&scope=email&state=123456

Facebook replies with

https://www.example.com/users/auth/facebook/callback?code=abcverylongcodexyz

Therefor the URI that needs to be whitelisted is simply "https://www.example.com/users/auth/facebook/callback", without the code part.

FWIW, when I moved my site from http to https I needed to update my config/initializers/devise.rb to include

config.omniauth :facebook, '1234', '34567', :scope => 'email', :callback_url => 'https://www.example.com/users/auth/facebook/callback'

as it was still using the http: protocol in the callback url, and you can't whitelist any URI in that protocol under the current guidelines.