HELL no. I keep my Facebook/LinkedIn/etc profiles separated as much as possible from my forum accounts. I don't use facebook login for ANYTHING. I'm very against this idea and would just plain leave the site if it became a requirement.I have another idea as well, which could be good in ensuring successful transactions -- what if every buyer or seller (just the users who want to participate in the marketplace) needed to verify their account at STH with a Facebook or LinkedIn profile so that there was more of a chance of the person being 'legit'?