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I found the following on an old post:

Do not re-tag only to change the format of the tag (ie: stackoverflow -> stack-overflow). This is done automatically by the community user.

Is the Community user programmed to retag posts? I am asking because I haven't seen any such retagging done by the Community user, and I haven't found any recent reference to this activity in the FAQ, or any other post.

Should we avoid retagging posts to change the format of tags such as adding 'dash' for multiword tags?

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Well, the community user is indeed doing tag tuning and it appears on its profile, saying "Automated tag tuning" in the edit remark.

From what I was able to find it's doing those actions:

  1. Changing the tags order. (See revision #4.)
  2. Changing tag name by making it plural (adding "s").
  3. Adding tags.

I'm pretty sure this is part of automated process, couldn't find any official source though.

As for the question at stake here, this answer covers it nicely.

  • Thanks for finding that but all of these edits are from 2008. I guess Stack Overflow team must have disabled auto tag tuning later on. I see some problems in auto tag tuning by the Community User, for example in this post, http tag was replaced by https tag assuming a singular to plural change but it is wrong and was corrected back by another user. – Aziz Shaikh Oct 31 '12 at 9:33
  • There is good chance there were such edits later on, but I can't really search in over 1000 pages of revisions. :( – Shadow The Burning Wizard Oct 31 '12 at 10:19
  • Isn't tag order solely dependent on tag popularity? – Asad Saeeduddin Feb 19 '13 at 21:10
  • @Asad now it is done automatically when adding or editing a question but it wasn't like this always. – Shadow The Burning Wizard Feb 20 '13 at 8:01
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Should we avoid retagging posts to change the format of tags such as adding 'dash' for multiword tags?

You cannot create a tag that is similar to the another one, and the difference is the presence or absence of hyphens. If you do it, you get a message saying, "You are attempting to create the tag [new tag]; however the tag [old tag] already exists!"

screenshot

The only users who can create those similar tags are moderators, who can rename tags without retagging every single question.

As for the Community user retagging questions, I have never seen this happening.

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