Officially down: (officially as in the sites checking this stuff say so!)

http://www.isitdownrightnow.com/facebook.com.html

http://www.downforeveryoneorjustme.com/facebook.com

I don't know why but the one system status page I can find is not isolated from the rest of fb: https://developers.facebook.com/status/

Seems to be a 500 error - I'm sure it will be up any minute, no reason to panic :)

Should have used AngularJS am I rite