No. Not me. For the same reason I don't blog a lot or spend a lot of time on the internet for entertainment purposes (unless I'm already on for another reason, like to check my email, maintain contacts, research, train, etc).
But if I were younger and had more free time I most probably would.
There are several people on this site who seem interesting to me and that I'd probably like to get to know better if I had the opportunity.
I'm not the kind of fan of the internet that thinks it's the greatest invention in human history. But when it comes to information availability and networking, I think it's generally a superb tool.
So I don't, but I would if circumstances were different or if I were more able.