Logging in with Twitter is currently failing - the error message returned is "We could not log you in with twitter"
Seems to have started failing after the last deployment.
Have tried to manually call the v2.1/twitter/request_token with what I believe to be the right id and secret, and the error returned is
"This client cannot perform this action"
Which as far as I can see is thrown by isClientPermittedPasswordGrant(), which suggests the DB lookup is failing.... (either that or I'm getting the API request wrong!)