whenever i see someone use a tag with double hashtags (i.e. "##anime"), i'm sure the reason is they either typed it like that on accident or pasted it weird or something
but i think it's also like, a fun idea as a marker for meta conversations. #anime is talkin about anime, but ##anime is talking about "the #anime tag and the discussions therein". and of course you can go as far as you want with this.
by the time we get to ####anime we're purely in the realm of speculative modern anthropology. nobody in this tag has ever watched a cartoon.
