I'm not sure if it's caused any problems for me. My entire life I've basically had problems paying attention to certain things, but on the other hand, if I was interested in something, I could do it for hours without wanting to stop. I read a lot so I don't have problems reading books or anything, but I certainly get into moods where I can't seem to focus on much of anything, internet related or not. But I've been that way since I was little (before I used the internet) so I don't think the internet is necessarily to blame for that.