Males probably suffer from a self-perpetuating cycle. They start off naturally a bit less socially able than the girls, and thus never quite get a toehold on the social ladder, and as a result are denied the oppertunity to learn, since that aspect of life largely passes them by, while the girls find it easier to break into it, and may even be drawn in by their peers, and thus find themselves in an environment that's more conducive to social learning. There's also the tendency for girls to help each other more than boys do, and to converse more generally.
It wasn't until I was 16 that I started to have friends, and even then they weren't particularly close friends. It's only in the past few years that I've developed really meaningful friendships and stopped being so embarrasingly inept at social stuff.
On a side note, for any guys wanting to develop their social skills, find a socially-savvy girl to be friends with (though that does require being socially able enough to make friends in the first place), who'll be happy to point out where you're screwing up and give you advice on how to improve things. I've been lucky to have someone like that for the past 3 years, and it's made a definite difference.