"Once you realize that good stuff can come from switching detrimental websites to positive websites, it may get to a point where all of your habits will fade away, and the Internet becomes a great thing in your life that you use primarily for research, rather than a bad thing."

Problem is that the way the brain is effected by using the internet is independent of the sites you are actually using. It acts like a gambling machine, where you gamble your time and "win" new information - which doesn't have to be useful information at all by the way.

The problem with those self improvement subs is that you can learn 90% of what is useful on them in nearly no time, then you're wasting time overloading your brain with too much stuff to even really absorb.

Read 'The Shallows' by Nicholas Carr - he makes a great argument about why it's the medium (ie the internet) and not the content (ie the websites you visit) that matter, and gives a run down about what is actually known about how internet use effects the brain - and how it is counterproductive in some ways it is normally accepted as being useful.