For the lazy, here's the link[0] where Mark talks about building a site that got students to upload their notes that helped him pass an exam for a course he hadn't studied for.
PG remarked that this was fitting answer for the "Tell us how you hacked a system" question in the YC application and added he has to constantly remind himself its too late to accept Mark into YC.
There's some very interesting things in that video. It set me to thinking about things Facebook isn't actually doing that Zuckerburg says he cares about. Which are things worthy of some further thinking to see what opportunities exist there...
