I believe in being careful but I agree there is a line that you can cross and live in fear. I don't want to live my life in fear. If you sign up for a swap voluntarily I hope you would trust the group you are in to give your name. I think anyone really up to no good can do it randomly and not have to know you personally or can buy whatever information they need from someone. No matter how careful you are your information is out there and available to some one who really wants it bad enough such as simple things with bank accounts and SS information with the federal government. No electronic information is fool proof.
Just my opinion.