From Bleeping Computer:
More information at the referenced article.
Facebook and Instagram users worldwide have been logged out of the sites and are having trouble logging in, receiving errors that their passwords are incorrect.
This outage started less than an hour ago and affects people worldwide, including the USA, Europe, and Asia.
Downdetector, a website that tracks when online services stop working, has received numerous reports indicating that the outage is not isolated to a specific region or country.
The outage has caused people to automatically get logged out of Meta and for Instagram to no longer work, giving errors like "Couldn't refresh feed."
When logged out of Facebook, users are being shown a message stating, "Session Expired. Please log in again."
More information at the referenced article.