It's already happening.

Bot gang stalkers. Not being able to tell if a person is real. AI accounts talking to each other. AI gaslighting users to follow specific policies and agendas. News organizations and internet demagogues some people like to quote/credit don't exist. Voice cloners. Deepfakes. Weaponized AI agents hooked basically on anything used as communication... All of this will have unprecedented effects in the human brain.

You are not paranoid enough, my friend. Proceed with caution.