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How does the automatic subjective filter work?

I'm very curious about how people think Stack Overflow is determining whether or not a question is subjective and highlighting it once you've entered the title. I'd like to build a similar capability but wouldn't know where to start. The AJAX callbacks, HTML and stuff is easy ... but analysis the question itself seems to be quite complicated.

  • @Jherico - beat me to adding the subjective tag :)
    – Russ Cam
    Oct 2, 2009 at 20:14
  • How is that possibily not programming related? I'm looking for a code sample to do this. Is it regex? Is it a natural language processor. The magic of StackOverflow is waning.
    – Nissan Fan
    Oct 2, 2009 at 20:16
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    @unknown: if we hadn't migrated it, it'd be more difficult to point out the many questions that already address this (such as the one Pesto linked to). SO-specific questions belong on Meta; if you didn't intend this to be specific to SO, then you shouldn't have phrased your question the way you did...
    – Shog9
    Oct 2, 2009 at 20:20
  • look for words like "best"
    – dotjoe
    Oct 2, 2009 at 20:24

1 Answer 1


Compare the words in the title to words in titles of questions that have been closed as subjective. If, say, 30% (adjust as necessary) of the words match you might have a winner.

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