os-rot contains two questions. One was a duplicate (of a question that didn't need the tag). The other asked, "What is OS rot?" in response to the duplicate. It appears to be unnecessary and not understood.
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yeah, I'd just go ahead and remove them. Its a useless tag :-) – Robotnik Oct 24 '14 at 1:20
Ah, I just removed those tags, including the related questions which were just a huge collection of personal opinion about how everybody keeps their machine clean. Not really a form of question we'd encourage anymore.