My b/g twins are super social. Almost too much sometimes.
They have two older sisters and I wonder if that is one of the reasons. They are used to being around kids at ballet, soccer, school stuff and just being on the go with lots of kids around. This is their second year of pre-school and they both do an activity (Claire does ballet like her big sisters & Sam does soccer). They do love being together and playing but I have noticed at school (it is a co-op, so I work once a week) that they are really comfortable playing on their own with their own friends. They do like knowing the other one is around but they are both pretty confident little guys.
Melissa
Mom to Emma (4/03), Kate (7/05), Sam and Claire (6/09)