At the risk of being slightly off topic: people rarely discuss the fact that reading a book can have a negative impact on one's life. Books are just a materialization of ideas, and they can be good or bad. They can steer you down a promising path, or an equally unproductive one. And the problem with books is that they can be very persuasive, using rhetoric, 300+ pages can convince you of many things.

I've experienced this, and in the course of my own studies, certain books have taken me down paths that were not the optimal, and I sometimes wonder what would have happened if I hadn't read (and remembered) those books so well.

That said, I've become a much more critical thinker after these episodes. Sometimes it's taken years to unwind the effects, but I guess my point is, books/blog posts/people are in many ways just ideas, and influences on us. Arguing over whether we forget them or not is not the most important thing about them--what is, is developing the critical thought process to wonder if they are in fact worth remembering at all.