There is literally an NFT marketplace specifically for selling tweets now

I personally don't recommend people invest in NFT tweets, but each to their own!
The fact that a marketplace for this exists says enough in itself...
It seems currently the most popular tweet is from Elon Musk talking abut selling a song as an NFT:
https://v.cent.co/tweet/1371549960030842893Currently the highest bid (not for the song, but the tweet) is now over $1 million

@sinaEstavi offered $1121000.00 ( 625.64124552)
Elon has said he won't sell the song as an NFT anymore, but the tweet about it will none the less be sold.
Bare in mind it seems that a random twitter user put this up for sale, as a joke, but now will make $1m from this pun!