Matmum and intparent, DS9 fits here also, poor eye contact, lack of ability to read social cues etc. I remember a time last year when he invited a friend from school over - a girl - they came in off the bus and he asked if she wanted to play a video game. When she said no he said nothing and proceeded to wander away both physically and mentally, not hurt just no idea what to do now that plan A didn't pan out. If DD6 hadn't been there the poor girl would have been hung out to dry - DD immediately began to ask if the girl would like a snack, does she like cats?, would she like to see her room and the cat etc. I have wondered about AS but he does not fit in many ways either.
Thanks for posting this thread - nice to know others share the same experiences.