No, the best way to use the tag system is to enter tags that are relevant to the given post. For this post, relevant tags would be: tags, tag system, threads, cr4 questions
Here the site FAQ information on tagging. Adding tags to a given post makes it easier for you and future site users to locate posts on topics that are of interest to them. By tagging a post, the given post ranks more highly in a generic site search and can be located quite quickly if a user wants to review the tag cloud for topics of interest.
Tagging an item with your user name or a generic standard isn't necessary, or particularly helpful. You can locate all of your own posts through your profile page.
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Off to take on other challenges. Good luck everybody! See you around the Interwebs.