Facebook is down in some parts of the world (pulse.turbobytes.com)

Yep, can't see it... Montreal, Canada.

Still down in europe ERR_CONNECTION_TIMED_OUT

same, UK

http://www.isup.me/facebook.com says it's down as of now. But it works for me, from Denmark.

edit - Actually checked the link provided by OP and felt humbled.

*edit - ran the test again. error rate down to 28%

Looks like its starting to recover in some places.

NOTE: China is down not because Facebook, but because of GFW..