[master-lincoln]

Why shouldn't people in Nigeria be able to communicate with people from random North American towns?

Because there are some criminals in a geographical area you want to exclude the whole area? Why don't you demand a US-only internet instead?

[IG_Semmelweiss]

Correct. Yet you can easily inform the end user, to get informed consent.

"NOTICE: The user appears to be in XXX, Nigeria. Beware of scams or impersonations by people hijacking your friend's accounts"

But Social media companies would never do this because it would destroy their so called "brand-trust"

[mthoms]

This seems like a good idea. The other variation to cover would be "this person appears to be connecting from a known VPN... [insert further explanation/warning here]"