I don’t use LinkedIn a lot, but I do try to go over there once every week or two and update my status, add a link, and accept connections.
I have a simple philosophy on connections: I accept them all. I don’t worry if I know the person or not, if they’re a recruiter or fellow technical pro, I just accept them.
My thoughts are that the more people I can touch if I need help, the better off I am. It doesn’t matter where they are, or how I know them. A broadcast for network help is a broadcast that I want to reach everywhere.
If the person is someone I know well, I do take a moment and move them into my A or B networks.
I feel differently on Facebook, which is for real friends and family and I rarely accept friends there.