Social networking site Facebook is asking its more than 900 million users to provide their mobile numbers for security reasons.
According to a Daily Mail report, the move is part of the drive to secure passwords from being hacked.
It has been reported that LinkedIn and eHarmony networking sites have been hacked in the recent past.
Apparently once a user confirms his phone number, it allows the site to automatically wipe his password if his account were to be hacked. And the user is immediately sent a message informing that his password has been changed.
The security message has been seen by millions in the US and will be on all accounts in the next few days.