Twitter login gets "error" Facebook login gets "Feature Unavailable"

My site is

For the past three days, users have been unable to sign up or login through Twitter and Facebook.

An attempt to login with Twitter briefly triggers the pop-up, but then it disappears. Then beneath the social login buttons appears a message in red saying "An error occurred. Please try again later!"

An attempt to login with Facebook triggers the pop-up but it only says "Feature Unavailable... Facebook Login is currently unavailable for this app"

How can I fix this?


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