I found this yesterday - looks like it's old news but I'd never seen it before and I thought it might be interesting as a poll. It's 4 subtypes of 'social impairment' in all ASD's, defined by Lorna Wing. (My descriptions are compiled from a few sources.)
I definitely fit in the passive category. Even within each subtype it probably manifests in different ways for different people... for me I'm usually happy to talk to people (not always though ), the problem is that the idea of interacting or conversing socially just doesn't cross my mind. If the other person initiates, that external cue reminds me that interaction is even an option. I can and do initiate conversation if it's not social - something directly related to the task at hand like a question or sharing information, but unfortunately the idea of talking socially rarely even crosses my mind as a possibility or something that I should be doing. It can be incredibly frustrating because people see that I can talk perfectly well, so when I don't initiate socially their natural conclusion would be that I don't want to talk to them, or that I'm stuck-up or whatever. (Sorry for that little monologue, this is just something that's been on my mind quite a bit over the last week or two and these subtypes fit well with it.)
Aloof
-may isolate self
-may become electively mute
-complete withdrawl from social interactions
-behaving as if other people do not exist
-little or no eye contact
-no response when spoken to
-no response to cuddling, may respond to rough-and-tumble play
-only show extreme emotion
-seems to be in their own world
-use people only to get what they want
-show no empathy
Passive
-passively accepts social approaches as long as the other person initiates and keeps it going
-may enjoy social contact but does not initiate it or seek it out
-may or may not make eye contact
-social approaches from people are tolerated as long as they're not sudden/unexpected or intrusive/disruptive
-quiet, easy going, can engage in activities led by others
[my input - could be related to executive dysfunction?]
Active but Odd (their wording, not mine)
-own needs seen as priority, egocentric
-little concept of compromise
-assertive sometimes to the point of being overly aggressive
-poor eye contact, or stare
-initiate verbal interactions, but one-sided monologue on topic of interest
Over-formal, Stilted
-good language ability
-excessively polite and formal
-rule-driven - black and white thinking, no grey areas
-try very hard to stick to the rules of social interaction without really understanding them