New Bravado Idea: Company Blacklist

Inspired by @Kirby's post and subsequent quitting, I think there should be a company blacklist (and whitelist) where we can raise flags on who and who not to work for.

It's a problem that plagues our profession and I'd love to not waste my time at a sand trap of a company. 

I think the poster should include a description for their reasoning, whether if it's workplace conditions, anecdotal stories, etc.