[tor-talk] Why does Facebook claim my Russian exit node is in Colombia?

[blobby at openmailbox.org]

Can someone please explain why services like Facebook and Gmail are so 
wrong when they attempt to geo-locate exit nodes.

As an example, I set ExitNodes to {ru} and logged into my Facebook. This 
locked my account. When I logged in Facebook told me there was a 
suspicious login. It claimed the IP address of the exit node in Russia 
resolved to Colombia! I checked the IP address with WHOIS - it's in 
Russia.

Can anyone tell me why exit nodes are frequently placed in a totally 
wrong location by companies like Facebook which must have complex 
algorithms to detect where their customers are from.

Is it something to do with the exit node as I can't imagine how Facebook 
could get it so wrong.