I've attempted to make a lot of cancerous memes by shitposting it on all boards
A successfull one lately was spamming /co/, /mu/, /v/ and /b/ with shrek pictures. On /v/ I would post "where ican find shrek2 vido game", /co/ I would post mostly reaction images with shrek to homostuck, /mu/ I would post shrek albums, /b/ I would post shrek stories. I've made heaps of shrek OC that people use now
Shrek is intended to be an 'ironic fandom', and I've been using shrek to reply to mlp threads on /b/, like spiderman replies to wincest.
Also made a lot of threads like from 2011-2012 I used to make John threads every day, until forced_anon was implemented. I've accumulated over 100 john replies.
I made the Korie Sapp raid threads, they were okay, we found his address, phone, relatives, etc but nothing really happened other than someone taking a picture outside his house of his numberplate.
I've made a script enabling us to upload embedded sounds in images, and playing the music in your browser. it got popular on /v/ but moot decided to block it, it's now rescripted and works again (
http://userscripts.org/scripts/show/154526 &
http://userscripts.org/scripts/show/157134)
Lately, I've been posting every day of a black guy shouting out with the text "HOLY SHIT TURN ON CNN"