Your instincts are correct. I happen to know that DMs at Twitter are (and most l...

		spudlyo on Feb 16, 2019 \| parent \| context \| favorite \| on: Even years later, Twitter doesn’t delete direct me... Your instincts are correct. I happen to know that DMs at Twitter are (and most likely still) stored in a sharded MySQL store[0]. Deleted DMs and tweets are "tombstoned", and not actually deleted via a DELETE, which has pretty terrible performance characteristics in MySQL [0]: http://highscalability.com/blog/2011/12/19/how-twitter-store...

I wonder what they use to generate IDs! /s

Man that comment popped up a bunch in that blog post, lol.