Business Networking?

I am looking for a website in business networking. A lot of people have already recommended websites like myspace and facebook, however, everyone has access to these websites. I would like a website exclusive to only small and medium sized businesses. Can you help me?

Business Networking?
I am not sure of any. the problem is that most networking websites are free to entice users. LinkedIn has been a highly mentioned business networking website of late. What do you want to do exactly? You might be better off trying to find a professional organization that caters to what you want.