My Twitter account is currently locked and I don't look at it, but I'm hard deleting it this month. If you have a Twitter account you don't read, I also recommend full deletion before Nov. 15. Here's why.

Twitter has their TOS now in an unusual state https://x.com/en/tos with two copies of the TOS printed one after the other, with a notice the new TOS goes active November 15.

The major difference I see is starting Nov 15 they give themselves explicit rights to train AI models on your posts.

Concerningly, the wording of the new TOS implies they can / intend to do AI training even on accounts marked "private". The TOS says they will respect your choice to "limit distribution… to a restricted community"— but only in the EU version, and per my read (I am not a lawyer) this applies only to "mak[ing] content available", not training. I could be wrong on this point, but I am choosing not to take the risk.

If you have sensitive content on a private Twitter account, think about this hard.

My reading of the old TOS (again, not a lawyer) is Twitter loses its copyright license to your posts when you delete your accounts. I worry Twitter might have already used my posts for AI training ("grok" must have been trained on *something*) and I don't think Elon Musk follows the law, but at least by deleting, if courts someday rule AI models are derivative works needing copyright permissions, Twitter won't be able to say "good thing all these dead account holders gave us explicit permission"

(One unanswered question: There is a checkbox granting permission the rights to use "your posts" to be used for "training and fine-tuning" "with Grok". If you uncheck this box, will Twitter refrain from using your posts for training, even after the Nov. 15 TOS update? On the other hand, will this box still exist after Nov. 15? Or will this box still exist in two years? Anyway whether you delete your Twitter account or not, I suggest unchecking this box.)