I personally find paper books to be frustrating, especially if I need to go look for a particular reference. The ability to search an ebook by keyword cannot be overrated. There's really nothing special to me about the tactile nature of a traditional book. It just gets in the way, for the most part.
Interestingly, I also find that the depth with which I read something on the Internet actually changes based on where I found it. For example, I read through this entire article primarily because it was linked on Hubski, where the stated goal of the community is to inspire intelligent discussion. I knew that I'd need to read through the whole article if I wanted to be informed enough about its contents to post anything meaningful.
Had I found it on reddit, where the rapid consumption of content is my driving motivation, I almost certainly would have skimmed through it and moved on to the next meme or gif. On Facebook, I think my reaction might further depend on who posted it.