Zuckerberg was like every moron on 4chan. Not surprising. Also kind of goes along with the main narrative beats of the film. Cutting out the fluff, the film gave the impression that the Eduardo/Mark rift stemmed from Eduardo putting in startup funds, making himself the CFO, & then not doing anything productive past that. Mark resented that Eduardo had any control despite not involved in actually building the site, he didn't want Eduardo to have anymore input, & Mark stopped informing Eduardo of potential investments and business decisions.
Though it seems like Mark & Eduardo were only equatences in a class, & not actually friends. Which the movie really inflated.