The internet is a gigantic, it encompasses a large fraction of our lives, especially in the 21th century. Like every technology that has come along, the net has changed us in ways, we would have never imagined. But it does come with a large baggage of pros and cons, and unfortunately, attention deficiency is one of them.
Its not the internet who is at fault, it's us. Humans designed and made it, and we should blame ourselves for our own mistakes. There is a widespread 'disease' or 'change' in us, however may you'd like to define it. We are losing the ability to concentrate on reading text, read a book at lenght, or to listen at music at a stretch, or to focus on work (doesn't imply for everyone). Well, I figured out, that the 'instant' lifestyle we're perusing: instant messaging, instant search, instant replies, instant publication, etc, is changing us in subtle ways. We are unable to simply focus.