"We just got sold to McDonalds!" the Twitter feed -- re-branded with a McDonald's logo -- announced at around 12 P.M. ET on Monday.
"BURGER KING® USA official Twitter account. Just got sold to McDonalds because the whopper flopped =[ FREDOM IS FAILURE?" the account bio said.
Subsequent tweets mentioned hacking groups like "LulzSec" and the Anonymous Twitter account @YourAnonNews. A link to a deleted press released on Burger King's official website suggested that the group hacked more than just the Twitter time line in what they called the "#OPMadCow" operation.
Burger King did not respond to a request for comment by the time of publication.