This is what I'm talking about. At the end of product reviews, Amazon.com has the following one-line request, with separate parts going to separate db recepticles.
Comment | Was this review helpful to you? Yes No }|(Report this)
Clicking on the "Comment" section brings up a full-blown comment module.
Clicking Yes/No records a rating value (0 or 1) that gets added to a report at the top of the review that says
" 21 of 32 people found the following review helpful:" or whatever the count is.
I doubt I would need or want the "(report this)" which is a small red print request that goes to a module that allows one to report inappropriate content to Amazon.
Could be used for the stuff that verges on comment spam, I suppose. Or if a poster gets angry and use foul language.