Facebook said Friday it had been the target of a sophisticated hacking attack but that it had no evidence any user data had been compromised.

A 22-year-old Dutch man who sold credit card details online was sentenced to 12 years in a U.S. prison in a fraud prosecutors alleged caused more than $63 million in damages, according to the Department of Justice.

The Wall Street Journal said Thursday it had been targeted by hackers trying to monitor the newspaper’s coverage of China, less than a day after a similar revelation from its competitor The New York Times.

Enterprise security managers have yet another worry to add to their list: cyberwarfare attacks.

Hackers from China breached the computer network of The New York Times and stole passwords that allowed them to gain access to computers and email accounts for a period of four months, the newspaper reported late Wednesday.

Unidentified attackers stole sensitive information from hundreds of diplomatic, government, research and military organizations from around the world as part of a newly uncovered cyberespionage campaign that started nearly six years ago. The operation …