My friends who have homeschooled teens have found that their kids also have a real socialization problem; there's too darned MUCH of it! ;o)
The homeschooled children I have met can actually be overwhelming. They don't size other kids up to see who's "cool" beforehand, they just get in there and play. At an SCA event I once attended, I was camping with a large group of homeschooled families. When I first sat at the fire, a little girl came up, introduced herself, and plopped herself on my lap.