Whether you think it is a good idea for a brand to let each location try to manage their own social media existence, you have to agree that bad grammar, odd hole punches, and strange boarder/margins are not a good idea. I think this is a great example why I tend to lean towards brands holding as much control as possible over even the mirco-local instances of their social media face. This might not be true for all brands but i think is is safest for most.
Have you seen any instances of good or bad mirco-local social media pushes by big brands?