I found this Social on Ning and we have a Social on Ning in the same space which may be of interest to you:
www.americanbusinessmedia.ning.com or abmsocial.com
We are a Private Professional Social Network (meaning once you've applied we have to be sure you are a part of a company or are a business professional before you are accepted.)
unlike other socials on Facebook we are able to prevent "just anyone" joining..
Of our 400 members you will find JUST industry professionals and leaders in your space... We have about 23 discussion groups each in their own vertically focused silos, I would encourage you to check out our Videos from our Events & Panels, and for some real value we also have an iTouch giveaway for the person with the most invited and accepted members.