No, Zuckerberg did not set out consciously trying to "fracture society". He started out trying to provide a way to rate women at Harvard by how attractive they were, then by just trying to optimize revenue without any consideration for unintended consequences. Then kept going.
Not understanding the failure mode is going to just lead to repeating the same mistakes at even grander scales, like what's happening now with AI. Nerds obsessed with creating "AGI" without the capability or willingness to think through the potential consequences.
