On a smaller scale, we had this thread a few weeks ago about hyperlocal instagram shitposting pages, which seems to be a smaller scale of what you're describing about meme celebrities.
I wonder to what extent the phenomenon of internet celebrity is tied to locales and to what extent where you post from doesn't matter. The success of the aforementioned pages is really hinged on the local nature of the posters, but perhaps also limits the upper limit of page growth as the pages seem to be tied to posting 'in jokes' about their suburbs and cities.