spam implies low effort BS used in a low-hanging-fruit sense
LLMs will be used for aggressive, yet incredibly subtle manipulation, consensus building, and response tracking.
20-40% of social media is already bots, and in the future it is likely you will not be able to reply to anything anywhere without a bot either 1) responding, or 2) logging and sending your response to multiple parties instantly.
If the Stasi had LLMs the Berlin Wall would have never fallen
Though it's a use case people like Satya will want to avoid for reasons.