How does the automatic subjective filter work?
How does SOFU determine that "The question you're asking appears subjective and is likely to be closed."?
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I'm of the understanding that it looks for a few specific keywords (like "best") in the title. Try writing a nonsense title with "best" in it and hit Tab, then go back and change "best" to "biggest".
Update: Here's the definitive answer, from Jeff: How does the automatic subjective filter work?