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I was looking (randomly) through SO tags when I jumped to the last page which have some tags like which has Zero questions (among others).

Not sure if this a bug or I'm missing something here

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I've extracted the synonym tag part into a separate question: meta.stackexchange.com/questions/92063/… –  Shady M. Najib May 20 '11 at 13:26

2 Answers 2

up vote 5 down vote accepted

Unused tags are deleted, unless they're synonyms of another tag. But it does take a while for the tags to be completely removed from the system. Instead of being deleted immediately, they are silently and automatically removed after a period of time goes by with zero questions carrying that tag.

Browsing the list of tags by popularity and then looking at the last page is a fairly uncommon use case. Those tags are by definition the least popular tags on the entire website, probably not the ones that you wanted to see.

In fact, most of the tags listed on that page are synonyms of other tags. You can verify this by clicking on the tag, and then clicking the "synonyms" link at the top of the resulting page. , for example, is a synonym of the tag.

For more about tag synonyms, see this question: What are tag synonyms? How do they work?

I'm not sure where you think the bug is; this seems like expected behavior to me.

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What about the other point, the "follow/favorite" dialogue? –  Shady M. Najib May 20 '11 at 12:58
    
@Shady - It doesn't do anything. You can't follow or favorite a tag synonym: it's not actually a real tag. Any question someone tries to apply that tag to a question, it will be automatically retagged with the "master" tag. –  Cody Gray May 20 '11 at 12:59
    
That's exactly what I want them to do, to show the full tag and allow me to favorite it. Actually I was doing so (at the first couple of pages, though :D), going through the tags to check what I've been messing and adding the ones I find interesting to me –  Shady M. Najib May 20 '11 at 13:02
    
@Shady probably should be a separate feature request. –  Belinda May 20 '11 at 13:09
    

We already do this, see

Should We Zap The Low-Occurrence Tags?

I've implemented a routine that removes tags created more than 6 months ago which have been used only a single time. It will run monthly.

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