BusinessInsider: CNN Acquires CNNBRK Twitter Account:

Hard to believe, but the CNN Twitter account racing Ashton Kutcher to 1 million subscribers wasn’t even under CNN’s (TWX) control until recently.
CNN has taken control of the @cnnbrkaccount — and its 944,000 followers — we’ve heard. We don’t know the transaction details, and are waiting to hear back from CNN to confirm the deal and any details

More details from TechCrunch.