All of my friends who were homeschooled did boy scouts, church programs, etc. and almost all of them have better-than-average social skills. I wasn't homeschooled but, based on the outcomes I've seen, I'll be homeschooling my children at least until high school.
A potential confounding variable is that homeschooling doesn't happen without a good home environment with dedicated and involved parents, and that the student would be just as successful in a traditional schooling environment for those reasons alone.
