https://downforeveryoneorjustme.com/facebook also says that it is not just me.

Update: But these two say it's up:

https://www.isitdownrightnow.com/facebook.com.html https://downdetector.com/status/facebook/

... and a friend of mine in another European country says it works fine for him.

It is back up now - and https://downforeveryoneorjustme.com/facebook agrees with me.

Its back now https://www.isitdownrightnow.com/facebook.com.html