I've often wondered whether you could do something with timing
the longevity of things in people's inboxes as first order
approximation of "value".
It's been done. Not sure if it proved more effective than spam/not-spam
votes, though.
Details? This is a pretty open ended subject.
There's been papers at CEAS conferences. See wiki.asrg.sp.am for links
to the conference proceeding pages.
R's,
John
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