My daughter, though not labeled yet as gifted...is an extreme extrovert. She is very gregarious, has a wonderful sense of humor and is indeed exciteable. She has a high energy level and will just walk up to a kid and take their hand to go play.
She will talk to almost any adult however thankfully she does have some discriminatory behaviors which is good with strangers. I was concerned about that for a while. She seems to have an innate feel for who is "ok" and who isn't...I was the same as a kid.
She does much better with older children and adults...she tends to fight with kids her own age.