I haven't read the responses yet, so am just responding to this. I think you take the internet too seriously. Do you really think that how someone posts on the internet is somehow representative of how they operate in real life? You must recognize that fully functioning people can do different things in different places.
I'll freely admit that I don't to small talk and chit chat very well, which comes through in both my on and offline personae. This might make me appear more serious than I am, it's an easy mistake to make.
Where I've personally seen the most benefit is from arguing politics, having my ideas constantly attacked and in turn looking for ways to attack the ideas of others has sharpened my thinking process when it comes to evaluating ideas and then evangelizing them to others. Just like playing chess or poker online against other people will make you better at it through practice, I've found that the skills I gain in advocating online do transfer to my real life, in that I'm better at holding my own when arguing with people. Again, an area where many AS people have difficulty.