Poll IPv6 addresses aren't really supposed to spell out domain names, but Facebook has adopted an IPv6 addy that includes the characters "faceb00c."
A quick DNS lookup of facebook.com confirms this: the domain resolves to 2a03:2880:2130:cf05:face:b00c::1. Faceb00c. Get it?
At The Reg's London office, we can’t agree on what we should think about that. IPv6.BBC.co.uk also resolves to 2001:4b10:bbc::1 and 2001:4b10:bbc::2, so maybe this is a thing now? What do you reckon? ®