I don't obsess over it as a "special interest." But the subject is somewhat one of my goals to embrace in life.
A friend of mine is an Aspie, and I notice that we both have excelled in certain areas within the aspect of social protocol. But while one exceeds over the other in one area, also fails in another area in which the other reigns supreme. This is really peculiar to me, and I'd like to work with this concept.
We both help each other out where we have trouble, and its interesting how that works. Another thing is that I've had more NT friends than Aspie friends, and this is the only one I've been friends with while I am aware of the other's being an Aspie. My main point is that I'm not used to this, and I want to find out what makes one Aspie tick but not the other.
Example. One Aspie I knew back in high school would have an extremely annoyed tone of voice when saying "Hello?" while answering the phone. It wasn't just his tone of voice, for some reason that is how he genuinely felt when answering a phone.
When I call up said current Aspie friend on the phone, I sometimes imagine that he is annoyed. Although he isn't, this is what I am used to. This just goes to prove that all Aspies really are different.
Eventually I plan to extend my Aspie circle, just to experiment with one's social behavior over another. Like I said, it might not be a "special interest," but is an interest. This will serve a purpose far later down the line, I plan go somewhere with it. I want to use my experiences to help others, as well as myself.