The promised link to all things Nerdfighteria: http://www.youtube.com/user/vlogbrothers#p/u/0/FyQi79aYfxU
John & Hank Green describe it a lot better than I can, so why don't I just leave it to them? All I can say is that being introduced to the Nerdfighting community via the Vlogbrothers (John & Hank) has been one of the most inspiring and intellectually/hilariously stimulating experiences. I love watching their videos and all the interaction.
-Sami
