The Borg may turn out to be prophetic. We could turn into a hive mind of sorts. I've already been calling Internet fads, echo chambers, and meme outbreaks "Borgsongs." I seem to recall this term from STTNG for the omnipresent hive signal experienced by Borg.
Imagine a neural network who could design memes/songs by directly measuring a bunch of test subject brains. Kind of like a focus group. A short story even asked the question, could you engineer a meme/song so powerful that it could literally make you go insane? We know this stuff exists (brainwashing, cults, ...), but can you super concentrate it?
At some point we are going to be forced to start regulating persuasion.