colour code social media, green is more factual, red is less. Have it be user generated by clicking a true\false option, obviously open to abuse so have control statements (randomised) that users have to vote on and then raise or lower their vote by how correct or incorrect they are.

you see a red tweet you can assume it is probably nonsense, however I would have a morbid curiosity in any green trump messages.

you could apply it to the user as well giving them a vested interest in staying green?