Why Linkedin is a sweet idea

So i checked out the site linkedin.com.  It seems like it’s basically just facebook for businesses.  So that got me thinking, you could take most any successful website and a “business version” of it.  For example, you make a website that is basically Ebay for businesses.  This way business could buy/sell used office furniture or business assets to/from each other.  I dunno.  Maybe the ebay idea is kind of corny.  I guess my point is that we shouldn’t overlook the B to B market.  We talk alot about facebook and youtube, and the social networking power they offer, but the B to B world has alot of similar needs and opportunities.