You already have some independent ranking services for business entities, but what about people?
A place where you can rate a public figure (a business person, a guru, a coach, etc.) as either trustworthy or not. You can also write a review. The individuals reviewed can also comment. Others can search for a person they want to check on and see their ratings. Only people with personal experience with the ones they rate can rate them, and their rating is not used or published until that is verified.