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I spoke with an admin in the appropriate chat room who said:

"You can make & use any tag you want. If you create a tag for something like curation and it becomes popular it could be abused. It's a good idea to let us know about it."

Aha! Thanks so much @steemmatt!!!

If you have time, this would make a great original post. In the post you could help the Community know how to let the admin know; and how a popular tag could be spammed. I'm sure it's in the FAQ; but, great to read on the go.

Again, many thanks!

Peace.