Students asked to read a text on-screen thought they could do it faster than students asked to read the same text in print, and did a worse job of pacing themselves in a timed study period. Not surprisingly, the on-screen readers then scored worse on a reading comprehension test.
Similar to the idea that the internet reduces us to mindless clickers, i feel as if most of the content on the internet that requires some reading is usually skimmed through for a faster read to get the basic idea from the text only to go on to the next quick read. This as a whole would lower the comprehension of the text as a whole as the more subtle details are skipped in favor of just getting the big idea.