"Today, however, the company [Facebook] announced sweeping changes to many of its most prominent APIs, restricting developer access in a number of crucial ways.

Soon after, Tinder users started noting on Twitter that they had been kicked off the dating app and couldn't log back on, as those who used Facebook Login were caught in an infinite loop that appears to be related to an unknown bug.

Since you need a Facebook account to log into Tinder, this bug has potentially affected Tinder's entire user base.

...

Tinder has responded in a tweet, "A technical issue is preventing users from logging into Tinder. We apologize for the inconvenience and are working to have everyone swiping again soon."

Source:

https://www.theverge.com/2018/4/4/17200034/facebook-broke-ti...