[bhdz]

> how complex?

Yeah I thought about this very hard actually, and came to the conclusion that just a "weight"(+) button is enough.

And, if you care that much so that you would waste your time providing more ... contextual meta-info (about the weight itself), you simply need a pop-up and a quick way to select words from a common dictionary. Certain users can even make content "more spammish" by simply increasing the weight with a click (they agree with the labeling and they are "special" in some way).

This, and the weight itself should provide enough info for a comprehensive "decoration" of the postings.