I posted an answer to a question and it's been deleted. Why!?

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As we gear up for [Ubuntu Global Jam](https://wiki.ubuntu.com/UbuntuGlobalJam) I'd like to make sure when we are going through the site and marking items for removal in this (and any) clean up period we're leaving notices to users as to *what is really* going on.

This is designed to be a Community Wiki FAQ where each answer is a brief reason why a post may be deleted and how to remedy this. Please at least leave a comment with at least a link to the reason why the post is (or is flagged to be) delete.