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I noticed that Facebook login stopped working. When I click on the login button, and Facebook accepts my login, I am redirected to my Question2Answer site, but the user is not picked up. It might be related to a recent Facebook changes to make version 2.0 of the API not supported any more. See more: https://developers.facebook.com/docs/apps/changelog
Q2A version: 1.7.4
What is your site URL?
I just tried on my site though I used to use open-login and not facebook-login. It is working fine. And for your site it shows server error- so you should have more information in log file. It might be an ipv6 issue- checking log can confirm.

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