Several users say they are concerned that they have been victims of a cyber attack
Facebook appears to be down on Wednesday afternoon for many users, who are complaining that the system has disconnected them and is not allowing them to access their profiles again.
According to Down Detector, a website that monitors the smooth functioning of major online services, the problems on Facebook appear to be limited to Europe.
Several users even say they are worried that they have been the victims of a cyber attack.
In some cases Facebook is not responding at all, while in others it is displaying a message that the password is no longer valid. Users attempting to change their password report that the required additional security code has not been sent to their mobile phones as it should have been.
So far the company has not provided any clarification on the nature of the problem.