Part of the ignore system is that it watches the tags on things that are hidden and muted. If the system notices a tag popping up a fair bit, it lets the moderators know so they can check it out and alias it (turn all instances of the tag into something else) if necessary. The bar for this is very high - we don't want to influence the tagging system too much.
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So, eventually I won't have to see the adult themed tag "#cumguzzlingsemendemon" everywhere? Nice.
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That was just one of the tags I was referring to.