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1. Not sure at the moment.
2. I think we should keep them and add implications.
3. Yah, we don't like to use personal state as a tag ^^. Ha, that's a neat idea and I can't believe I never thought of that. That would be terribly useful. You got my vote on that, on tags that users may want to add, but we have tried to totally remove from the site, an implication to them to a tag like "deletethistag" should fully suffice, since it would ease the moderation on them and explain to the users that it's not in use no more.