JB,
I could write an article for you about my son. He's working 5+ grade levels above his same-age peers. Although we homeschool so it is easier to advance in grade levels and he doesn't "sit in a class" with children who are older than him. However he has no problems socializing with people of all ages. He has friends who are two or more years younger than him and also friends who are older than him. I guess I've never heard that children who are accelerated have trouble with socialization. If you have references for what gave you that idea, I'd be interested.

Lemonade