One of the best ways to get value from Linkedin is to participate in a group. Even better if you can set up your own group aimed at your target market. They are great for sharing knowledge and establishing yourself as an expert in your field. One of the first blog posts I wrote for Spiderworking was about setting up a group but Linkedin has changed so much since then I thought you were due a refresher!
We have a pretty busy group on Linkedin called Facebook for Business Ireland, join the discussion here.