At this point, may I suggest that this whole post is making sweeping generalisations? I mean, I don't think I'm the type who stops conversing with people...
However, since it seems that I am in the minority, I could perhaps give a suggestions. Women tend to overanalyse- look into things too deeply and therefore can misunderstand somethings. Like if you email a girl and say something stupid, like "Luv" at the end of your email, she may read into it too deeply and therefore back off by not replying.
On the otherhand, maybe the women you've been conversing with are just not so cool on the 'cyberspace' front. I mean I've experienced the same with some guys I know, but then again, I know that when it comes to computers, they're not very good at it.