I did that
But an example would be a thread entitled:
"Lambchop playing at the Barbican! OMFG!!! Ponies!!"
Really I want that tagged as 'gig', 'tour' as well as 'lambchop' and ideally not 'ponies'.
People are good at classifying, they like it because it helps improve their lives as they find stuff easier for such little investment. So all I'm saying is that for forums with legacy content (who here doesn't have old threads?) that people doing the tagging will be far better than code doing the tagging. And for people being able to tag historical stuff when events change, that's even better.