Hello,
I agree with you that sometimes it is a pain to find the introduction post of a user.
I would propose something different, if users could pin some of their post, so they are basically always displayed if you got to a "aboutme" menu. than it would be great.
under the aboutme menu we could add your facebook and other account for verification.
While i dont think we need account verification yet, if ebay started governing their site this early, they would never become that billion dollar company they are now.
you need a bit of a wild wild west gold rush mentality to push the site to a tipping point, so at the moment i am again any verification systems !!