I've come to the conclusion that we're an odd breed of introvert. My theory is that INTJs, given our method of thinking, are the most likely introvert to, around high school or college, decide, "Forget this, I'm never going to get the things I want if I don't learn to interact!", and subsequently put "learn to socialize fluidly" on our to-do list and go out there and get it done.
Yep. And factor in a little getting burned by people for good measure. You know, "Fool me once, shame on you. Food me twice, shame on me."
Sociability: 40 out of 100
Social Anxiety Disorder : 24 out of 68
Accept the past. Live for the present. Look forward to the future. Robot Fusion
"As our island of knowledge grows, so does the shore of our ignorance." John Wheeler
"[A] scientist looking at nonscientific problems is just as dumb as the next guy." Richard Feynman
"[P]etabytes of  data is not the same thing as understanding emergent mechanisms and structures." Jim Crutchfield
According to your results you appear to be the type of person who doesn’t socialize very often. You likely have a limited social network, and possibly aren’t really interested in extending it beyond a few close and intimate friendships. Having an active social life doesn’t appear to be an important thing to you. Chances are that when the opportunity arises to socialize among a large group of people, you’ll most likely turn it down if possible. This doesn’t necessarily mean you don’t enjoy socializing or being around people. Rather, you tend to prefer spending time with smaller groups of friends. Individuals who score similarly to you typically aren’t conversation-starters, especially with people they aren’t familiar with. In addition, they aren’t known to be exceptionally outgoing, unless among close friends.
Interesting, the INTJs I noted in this thread are very low on both tests - we're not extroverts and we're also not suffering from social anxiety.
I think this would be indicative of any type that prefers a Chart The Course interaction style. Since INTJs have been the only type to take this test until now, then yes it makes you unique. You should see a similarity with any type prefering INTJ, ISTP, ISTJ or INFJ.
As a result I would say that anyone preferring:
Behind The Scenes= Low Extraversion/Mid-High Social Anxiety
Chart The Course= Low Extraversion/Low Social Anxiety
Get Things Going=High Extraversion/Low Social Anxiety
In Charge=High Extraversion/Mid-High Social Anxiety
If this theory runs true, I would base it on the "Behind the Scene" and "In Charge" types need for control and the "Chart the Course" and "Get Things Going" types need for movement.