Has shitposting in some way or form always existed? Look at this shit http://www.pompeiana.org/Resources/Ancient/Graffiti%20from%20Pompeii.htm
So what causes the natural human urge to shitpost?
And why do some countries i.e Australia feel the need to shitpost more than others?
Listen have you been to Austraila m8?
After you get over the initial shock of kangaroo land, wide open spaces, and hostile as fuck/weird environment there's not much to do other than get smashed, play video games, and shitpost. Unless you live in Sidney, in which case your wealthy enough to afford a nice social life and booze all the time instead of having to occupy dead parts of it with shitposting
>Let everyone in love come and see. I want to break Venus' ribs with clubs and cripple the goddess' loins. If she can strike through my soft chest, then why can't I smash her head with a club?
>Weep, you girls. My penis has given you up. Now it penetrates men’s behinds. Goodbye, wondrous femininity!
And OP, shitposting is just an internet word for something people have been doing forever: saying dumb and funny stuff. People just like having a laugh and baiting others.