UPDATE 3 (9.42am): Facebook has released a statement acknowledging the downtime, at least as far as Europe is concerned, and claiming it has been fixed.
The statement reads: "Today we experienced technical difficulties causing the site to be unavailable for a number of users in Europe. The issue has been resolved and everyone should now have access to Facebook. We apologise for any inconvenience."
UPDATE 2 (8.21am): We are now seeing suggestions that it was a DNS problem.
UPDATE 1 (7.54am): Facebook appears to be functioning again in Germany. Also, reports have come in that it went down in South Africa, making it possible that the outage was EMEA-wide.
Facebook is experiencing downtime in Europe and the Middle East right now, according to multiple reports on Twitter.
Users in the UK, Sweden, Spain, Iceland, Germany, Turkey, Abu Dhabi and elsewhere said early on Wednesday morning that they were unable to log into the social network on their desktop computers.
According to some of the reports over Twitter, Facebook's smartphone apps, such as those for the iPhone and BlackBerry, might still be working.