Well, the person is on FB but I don't want to talk to them at all. Just curious where they are now, you know, the regular psychotic stalking stuff. Hehehe. It's like I just wanna know where they are, that's all. Stupid, isn't it? Nosy.....
Just because I am neurotic - it doesn't mean that people are still not out to get me !
Seriously: it is not hard to get a person's IP number from the internet - this will locate them within a small area which is probably enough if you only want to know WHERE they are rather than contact them.
If you look carefully through their Facebook comments and the replies you can normally narrow them down to an area of a city as bars and meeting places are frequently given out - then just Google the place on Google maps and they will kive with a few miles of it normally. If you can get a few locations that pretty much narows it down to a specific estate or block.
More seriously: As a debt collector in a previous life, if you physically go out to find them it normally takes less than a day to find soemone who is hiding - using just normal look and ask and a bit of thought.
Track the SS number. Look for tax filings, both property and income. Look for medical records. Car registrations and drivers licenses. Home purchases. Credit cards. Airline tickets. School records. Criminal records and/or traffic violations. Professional licenses or citations.
There are a thousand ways to find someone. Many are really only usable by professionals who often skirt the legal limits of what they can do (or just flat out cross the line) but those professionals may end up being your best bet.
If you don't want to be found, it is quite easy to drop of the circuit, remember it took 10 years for the FBI and CIA to find Bin Laden. I find it quite strange that after trying normal communication methods that this person hasn't contacted you, they obviously don't wish to keep in contact with you. This is a slippery slope and can only lead to disappointment for you. Let them go and start living your life.