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Every post can have 2 tags. One by the person making the post and one by the community. KB chose to not tag the post. He's right that if someone from the community tagged it rddit by mistake we'd be stuck with it unless someone from the community changed it. Once you get a badge, you'll see a +# symbol indicating that you can suggest a tag to a post you didn't author. If multiple members of the community suggest tags then the most popular suggestion prevails.