Facebook has revealed it was the target of a "sophisticated attack" by hackers last month, but found no evidence any user data had been compromised.

BBC: Facebook was targeted by 'sophisticated' hackers

Unlike Twitter, Facebook said it has found no evidence that any user information was compromised.

CNN: Facebook hacked, says no user data compromised

"We have no evidence that Facebook user data was compromised in this attack, " Facebook said in its blog post.

BBC: Facebook was targeted by 'sophisticated' hackers

Alternatively, as in the case of forensic evidence when the user does not know precisely what to expect, different combinations of frequencies can be examined to see if anything interesting emerges.

ECONOMIST: Monitor

They use evidence collected about the user, like typing history on social networks, where they are on the Web, or what terms are trending on the Web to determine what word to select next.

WSJ: The Future of Typing

In its findings, Interpol concluded that Colombia did not conform to internationally recognised principles for handling electronic evidence but also that "no user files have been created, modified or deleted on any of the eight Farc computer exhibits following their seizure on 1 March 2008".

BBC: Colombian Farc rebels' links to Venezuela detailed

There is no evidence - none at all - that user fees prevent patients in devloped countries from seeing a doctor.

BBC: 'Why patients should pay'