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This might be an annoying bug, but I wouldn't call this a doxxing vulnerability. Your userid stays the same, no matter what your handle is. Of course, the userid is mostly hidden for the end user, but there are a few services that track changing handles by referencing the userid. So you could be doxxed all the time anyways. Now it is just a bit more obvious.

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The internet is permanent, and if Twitter themselves don't remember a display name you used to use, 3rd party services will.

If you need to erase your old identity, it's best to create a new account and use your right to be forgotten to have Twitter delete your old stuff. And while the GDPR and the like mandate how that SHOULD work, you can't trust that it WILL work.

Twitter seems to obfuscates recycled username creation dates too. I deleted an OG account from 2008 last year and now I see someone has claimed it but it's join date is from 2018.

If you create a Twitter List and add users into it, they stay in the list even if/when they change their handles.

I used this approach to keep track of scammers a while back when Twitter DM scams were a thing amongst the circles I was following.

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