Tweets from the Burger King compromised account included references to the hacker group Anonymous and LulzSec. The hashtag #OpMadCow was used to refer to the takeover.
On Tuesday, the Twitter account for Jeep was taken over by presumably the same hackers that hacked the Burger King account. The hashtag #OpMadCow was again used.
Source: ZD Net. Read full article. (link)