>>213257/bant/ is just the youngest board in a long line of experiments into memetic engineering. Hiroyuki's goal is to establish the optimal environment where budding hyperideograms are allowed to mature and develop into fast spreading and efficient "memes", as they're usually called. They're then sold to governments and various powerful people, who supply the memetic carriers with a semiotic charge and release it to the unsuspecting public.
Several attempts at this have been made, with various success. Tiny differences in the "soil" where the memes are grown will produce different results. Unfortunately, the last time a Great Meme was created, it took on a life on its own and was charged with semiotic power before it could be harvested and directed towards a purpose. 4chan leadership hopes that they'll be able to grow a new Great Meme here on /bant/, or at least study the growth cycle of lesser memes and tweak the conditions for optimal results.