The shitpost is the contemporary advance of the philosophical genre of "fragment" as developed by Schlegel and Novalis.
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"As a philosophical form, the [shitpost] reflects the conditions of modernity. In Friedrich Schlegel’s view, the hyper-reflexive expressive registers of irony and humor are particularly suited to voice the modern mindset, and are, as such, intrinsically linked to the [shitpost]"
https://plato.stanford.edu/entries/novalis/#FraPhiFor
Just as a fully systematic [poasting] might be an illusion, a completely unsystematic [poasting] would instantly kill off every intellectual ambition. Thus the challenge of [poasting] consists in the attempt to think systematically but without allowing thought to stagnate in a final set of truths or dogma.