Over at Why is the first tag sometimes in the <title> tag of some questions, Rebecca mentions

To this end, the tag listed first on a question (sorted by popularity of the tag)

So, what's the basis for tag popularity? Views? It sure as hell isn't number of questions.

1 Answer 1


As Jeff mentions in his answer on that question, the implementation appears to have changed since then. To make a guess, I believe that they now look at the top 2 tags on a question. In your example, Windows 7 is included in the title, so it isn't prepended as a tag. It moves on to the next tag. I wonder what happened if you edited the title to say 64 bit rather than 64-bit. My guess is that the tag then wouldn't be prepended.

On the WebApps question, google chrome is contained within the question, though not as a phrase, so it is omitted, and the logic moves on to the next tag. Firefox isn't in the title so it includes that.

Again, just a guess from observation.

  • But then, [windows-7] should've been the obvious title-tag, right ? How come it isn't ? Commented Dec 19, 2010 at 3:33
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    @Sathya, because [windows-7] is parsed out to windows 7 which is already in your title. The code logic doesn't duplicate a tag that is already in your title. Commented Dec 19, 2010 at 3:34
  • Makes sense. @Rebecca. Commented Dec 19, 2010 at 23:38
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    A discussion came up today in chat over what tags should go on the branch predictor question. Would it make sense to allow some manual control over what tag is appended to the title. Putting branch-prediction into the title would greatly increase the search engine visibility of that question. But it doesn't feel right to edit the actual title of the question since that essentially changes the question itself.
    – Mysticial
    Commented Sep 2, 2012 at 19:29

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