Twitter still keeps archives of your DMs years after you deleted them

Uh-oh, this doesn't look good.
You know how when you delete a Twitter DM and you're expecting it to, like, be erased and non-retrievable ever again? Turns out Twitter's still keeping archives of deleted DMs according to a security researcher who shared his discovery with TechCrunch.
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Speaking with TechCrunch, security researcher Karan Saini discovered he was able to retrieve old Twitter DMs he had deleted years ago. 
Saini says