Just over a week after being offline for nearly an hour, Facebook experienced server problems again this Tuesday (20th).
According to reports from several countries – including France, Great Britain, Portugal and the United States – many users are unable to access the site, send messages via Messenger or view photos on Instagram.

Many users have been experiencing some problems with the site, such as new posts not loading, failures to display profile images or send messages via Messenger.
The company has not yet commented on the issue, and it is not known when it will be resolved.
Source: canaltech