How often can the " Introduce yourself" tag can be used in steemit posts?

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Ideally, the introduce yourself tag is meant to be used ONLY once since it is expected that users only introduce themselves to the community only once.

However, there is no constitution or law that restricts anyone from using the tag as many times as they want. But since the introduce yourself tag is a special tag and since you will not like anyone who introduces himself to you on every occasion, commonsense requires a very cautious use of the tag.