It seems now that LinkedIn has finally positioned themselves as the primary social network for b2b. It wasn't always this way, in fact up until recently, myself and others considered LinkedIn to be a job bulletin board on steroids. But LinkedIn's new "Company Pages" has helped to change that perception in a hurry.
If you haven't experienced these new Company Pages yet, they allow for products and services to be put on display, provide the mechanisms to announce online promotions, and include the ability to upload multimedia such as graphics and video to help promote the business. But the most powerful feature of all is the LinkedIn's adoption of the pre-existing recommendation utility into their Company Pages.