I stumbled across this site today, and it looks potentially intriguing. It doesn't seem to have a lot of members yet, but the idea of a metals-specific social networking site does appeal to me! I've joined, though I haven't participated yet, and thought others might be interested.
Please note that I am A Bad User and did not wade through all the terms and conditions, so I'm not vouching for them.
I am cross-posting this, so you may see it more than once.