<p></p>
<p>Including an admin interface seems like an unnecessary distraction for an initial version at least - it's not clear when it would be used or even if it should be used. I can't imagine a situation where it would be appropriate for an admin to remove a block that a user had chosen to add.</p>
<p>I would say that the minimum necessary is a table listing blocks, a couple of appropriate links/buttons where users can block/unblock people and code in the message send function to respect blocks.</p>

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