best answers make sense - in area's like crosswords, IT, law etc where a correct answer that solves a problem is easily identified to someone looking for an answer to the same problem
Don't really see the point or relevance in cb/news etc when its often given to the person who agrees with the OP's point of view, so its not really a "best answer" but and acknowledgment of a viewpoint
as to the other badges, i don't really pay any attention