I'm not a native English speaker, but whenever I see the label "Belongs on ..." makes me feel it should be "Belongs to ..." somehow? Can someone explain the wording?
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The word "belongs" can be used in a broader sense, without "to". For example, "the suitcase belongs on top of the wardrobe". Since you would say a post was "on superuser", it's correct to say "belongs on superuser" in that context.
Belongs on refers to a place to where it has to be kept?
Belongs to refers to a person that owns it?
It might also help you to review the definition of "site":
Note that 1 and 2 refer to a location in the physical world, while 3 builds on these to establish a metaphor: a page or set of pages on a given host can be thought of as similar to to structures on a particular piece of ground.
So if a question is a structure (say... a bike shed), then it belongs on a piece of ground somewhere - and the close reasons establish that it was originally constructed on the wrong site.