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From Appropedia

Usage:

{{Topicadmin|UserName}}

This template adds a topic expert as the regulator for a topic category. This person should have some expertise and commitment to watching the category. If you are interested in becoming the topic expert please see topic experts for more. This temmplate is used primarily for Category:Topics categories. Make sure to see the pages that use this template before changing.

This would be better if it:

1. could be administered not in the wiki text
2. would show up below articles and subcategories