not related to emacs/lisp, but asking here because you guys seem like the least retarded people on this website:
For a few months now I've been seeing more and more filenames like IMG_4929.png and so on, basically always following the pattern IMG_nnnn. This happens on all 4chan boards I visit.

Are these bot posts, or is there just some browser extension, 4chan app or phone OS that renames files after this pattern when you upload them here?