Just what we need: another spoiler debate

This one is comics-related. There are a LOT of comic book related shows on the air right now. What should the spoiler guidelines be for information from the comics that isn't revealed on the show? It seems week after week after week in the threads on shows like The Flash, Arrow, Gotham, etc., there's discussion about the backstory of various characters that hasn't been revealed in the show yet, or how a certain plot differs from the storyline of the comics, or how a certain character is different from his/her portrayal in the comics.

If we follow the spoiler guidelines for the forum to the letter, no information from external sources is allowed. I've seen threads for shows like Game of Thrones and The Walking Dead that have separate threads for people who want to discuss the source material along with the shows. Should we follow suit with other comic book based shows?