What criteria should we be applying when deciding whether questions are off-topic? Is there any sort of rough consensus on this?
Cf. two prior meta.SO discussions: 1. why are seo questions shut down as not programming related?; and 2. Is SEO a sysadmin or developer issue?
(sorry, 1 rep, can't post 2 hyperlinks, high reputation users please edit)
Postscript — Since I'm looking more for a consensus, rather than answers, I've changed this to a community wiki.