Earlier quoted context omitted.
I would posit that the proportion of "originated from 4chan" notes on knowyourmeme.com are an indicator of its outsized influence.
I wouldn't bet much on KYM's provenance research. Memes spread so far so fast on the information superhighway, those that started on some Korean photography forum or Russian anime newsgroup, you'd never know if you weren't there ... or know where to look. KYM often cites 4chan because it's popular, in English, and well-archived (ironic indeed) and KYM editors will take the earliest hit from the third-party archives a…
and Mongolian is a stand-in for mongoloid, which fell off the euphemism treadmill as a descriptor for people with Downs syndrome.
So "Mongolian basket-weaving forum" means "place for r*, useless people"