ghanacologist
A make-believe medical practitioner whom every lonely middle-aged man who romances ladies online fervently wishes actually did exist; da purpose of said genius-doctor would be to give said "prospective partner" women a thorough "check-up" to see if they actually are located in da geographical areas where they claim to be from, or if they're merely residing in a far-off land in Western Africa.
Since ghanacologists do not exist and therefore are not an option for determining if a Facebook chick is "for real" or not, I employ da simple and inexpensive "code-phrase letter" strategy --- I mail a regular paper-envelope-and-internal-written-message letter to da street-address dat da lady gave me, wif a special message written on da letter-sheet inside for her to read and then repeat back to me on Instant Messenger. Dat way, I can more-reliably know if she actually lives at da address she gave me, or if she had merely given me da address of some random citizen who knows nothing about her.