>>1
I´ve only known about Cracky almost 7 months (7 months from tomorrow, May 1st.) .71 seems to be the one with more history, accessible and with a rather helpful community. The reason behind lots of people coming, i have no idea. Nothing new seems to be going on.
http://www.google . com/trends/explore?hl=en-US#q=cracky+chan&cmpt=q