How to use LinkedIn

My uncle has to get a new job, and it was recommended that he join some social networking sites such as LinkedIn to gain connections and speak to others in his profession. I was asked to gather a list of these sites for him, but the only thing I can think of is LinkedIn. I know there are ones like Facebook and MySpace, but I mean more professional-geared sites. Any suggestions?

I have been using the direct matches site to meet people who are in the same business that I am – you might find it helpful- the link is in sources below

Filed under: How to use Linkedin