PS - since there is also already a mod around called "Forced Ignore" whee admins can step in and make two users ignore each other, I think there is a legit need for this ability. This lets a person 'force ignore' someone who is bothering them on their ow, without the need for the mods to get involved.
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and what about the 'ignore a thread' hack? We have a long history here of giving users the ability to ignore things they get irritated by..