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Or it could just be a pretty smart marketing stunt.
Both MTV and BET are owned by Viacom and neither of them are tweeting anything too nutty. Oh, and the MTV account is using a conveniently tame and branded hashtag #MTVhack.
We'll try to get to the bottom of it.
UPDATE: That's right, it's a timely marketing stunt. From an MTV social media director:
Everyone watch @mtv right now... #MTVHACK
— Annie Schoening (@Schoprah) February 19, 2013