Clearly the solution involves web 3.0 Blockchain to provide irrefutable evidence of ownership of each post, with an off-chain oracle providing per-post licenses in machine-readable formats. </sarcasm>

...or you know don't say stuff in public if you don't want it to be seen by others. This is - and always has been - Internet 101 stuff: assume that the internet never forgets, and don't say anything publicly if you'd rather not see it on the front page of a newspaper.

I guess each new generation needs to learn that there are bad people out there, and computers make finding a needle in a haystack trivial.