I use LinkedIn a lot. Everyone says that it can't replace face-to-face interactions, and that's mostly true. What it DOES do is introduce you to people that may have similar interests you do.
LinkedIn is more popular in major job markets (New York, LA, etc) than it is in low-growth areas like, say, Tucson. If you live in or near a major city, it's worth a try. Chances are family and friends have LinkedIn accounts, so they make a good starting place.
I have a dash of Autism, and live in DC. People here tell me I am a good networker. Here, networking is an Olympic sport, so I feel confident with the advice I am giving you. Feel free to pm me directly if you need other ideas.