I've noticed that when I make the first line of my post

Hi Superuser,


Hello Superuser,

It auto-deletes it.

If it is anything else (maybe a few more variants of this exist), it will not delete. Is this intentional?

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Salutations are automatically removed, because posts do not need to have salutations. You can see the full regex used to select salutations to remove in the linked meta SO post.

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    Although itdoesntwork didn't ask why, I think it makes sense to mention that StackExchange sites are about building knowledge bases, not having conversations. So greetings are unnecessary cruft. – Isaac Rabinovitch Sep 7 '12 at 3:34

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