Also go back to reddit.
There is >>1049
but there's also the factor of unstable hosting in external sites. Some do not allow for "sensitive" material, gore and porn, and may be deleted before the thread is dead. Which I'm guessing to be a problem with reddit. There are also services that do not allow for posting webms, mp4s and pdfs and then view/stream them online (8chan allows pdfs), or on a permanent basis (which can range from mere hours to years, depending on the speed of the board).
You will also have to account for the fact that these services may get blocked in some countries and hence not viewable to some users, and that tgese services can go down at anytime.