The lack of a paywall is a challenge :-) and to be honest since I did my own research in 2000 my references are out of date, but just typing 'homeschool socialization' on scholar.google.com returns such gems as this:

"Compared to children attending conventional schools, however, research suggest that they have higher quality friendships and better relationships with their parents and other adults. They are happy, optimistic, and satisfied with their lives. Their moral reasoning is at least as advanced as that of other children, and they may be more likely to act unselfishly. As adolescents, they have a strong sense of social responsibility and exhibit less emotional turmoil and problem behaviors than their peers." -- http://www.tandfonline.com/doi/abs/10.1080/0161956X.2013.796...

When I was doing my research (prior to homeschooling my three daughters) one of the things I did was sit in the Stanford Library and download various journal articles on the positives and negatives. If you do the same (and I'm a big fan of people being critical thinkers) you may come to the same conclusion.