Oh shit we’re all really dumb
Hussie-as-Caliborn getting social media accounts (deviantArt, and possibly Amazon) isn’t just a joke, it’s a plot device.
Homestuck has been slowly breaking format more often the closer we get to the end. Art is no longer confined to panels, John is unstuck from canon, and a whole bunch of other stuff.
Caliborn interacting with the internet isn’t just a gag, it’s the next logical step of the story’s plot and themes.