Maybe not social skills, but what about experience?
One of the real benefits of LinkedIn is the ability to join the interest groups. I would think that someone with your background would have a great deal of experience to share with other people. We need mentors-- perhaps you would consider that role? There is also a section on LinkedIn called Answers. People ask all kinds of questions, and some of them are very specific. I'll bet you would be able to provide some insight there.
There's a large group of people on Twitter who specifically tweet about Java, or SharePoint, or Linux; they provide bits of code, or will look at someone else's code to help resolve an issue. They are the first to tell you there's an issue with the latest upgrade or patch. Good people to follow!
So while having a LinkedIn or Twitter account is not at the very top of my list when looking at IT professionals, IT people who participate in online communities get an extra check in the go column on my checklist.