AMC's show about an advertising agency set in the '60s, Mad Men, has been causing a commotion on Twitter. Three of the characters have accounts on Twitter and have been giving updates. The thing is, AMC didn't create those accounts and doesn't know who did.
AMC got worried that someone was representing characters on their show and was concerned about what they might published. AMC then filed a DMCA takedown notice of the Twitter accounts.
It is my belief that AMC definitely jumped the gun and panicked with the Twitter accounts. Why they took it down: they couldn't control the message. Why they should have never taken it down: free publicity. They eventually restored the Twitter accounts with some convincing from their marketing team.
Interesting side note - by ordering the suspension of the Twitter accounts and then reinstating them, Mad Men has received a lot more publicity than if the Twitter accounts were left alone.