The Stack Exchange Network frowns on [greetings and taglines](https://meta.stackexchange.com/questions/2950/should-hi-thanks-taglines-and-salutations-be-removed-from-posts/93989#93989) in posts. There were [mixed reactions](http://tea.mathoverflow.net/discussion/536/some-of-the-changes-in-se20-are-irritating) to this before we moved to the network. Should MathOverflow tolerate greetings or not? Is it appropriate to edit greetings out along with another edit?