Linkedin is just a business social site.
I use it to make introductions and as self-propaganda.
Our web guy says its great for getting people back to our corporate website and improving our rankings on search engines.
I really consider it a MySpace without the crap.
I was referred here from bb.com as a resource to get some real answers. I have been lurking on this board for 3 days and already learned more than being on bb.com for a month!