In case of hard evidence of its users being hacked, Facebook promises to send its users a warning notice and recommend how to protect their profiles in the future, reports Espreso.TV citing the Huffington Post.

- We will now send you a warning notice if your account has been targeted or compromised by an attacker associated with a nation-state, said Chief Security Officer Alex Stamos.

However, he has not disclosed on how the data collection on intelligence will be detected, saying he wanted to maintain some opacity about the question. In case of a possible attack the user will receive the following message:

"We believe your Facebook account and your other online accounts may be the target of attacks from state-sponsored actors."

Stamos also clarified that the reason for hacking isn’t that Facebook's own security systems have been compromised but that the user's computer or mobile phone has malware on it.

Most likely, this statement is a response to recent accusations of the company as illegally collecting personal information by users in Belgium.