Off topic.I am student and in last year I felt this drawback.I spent almost all of my day reading internet (scientific material, watching courses).But recently I can feel internet makes person a shallow, without deep understanding about topics.(I don't know how to express clearly). I recently completely switched from internet to reading exclusively book/papers.

Except for HN I suppose ;)

Exactly, because there are huge differences between people in HN and other people on the internet. most (not all) stuff in HN is quite good and the links to books/papers are my favorite ones.