Facebook lets people look up your profile using your 'security' phone number

Facebook lets people look up your profile using your 'security' phone number. [Photo: Mirror]

Facebook is facing criticism over the way it handles users' personal details, after it emerged the social network is using phone numbers initially handed over as a security measure for other purposes.

Since 2011, Facebook has asked users for their phone numbers in order to enable "two-factor authentication" (2FA) - a security feature that sends a text message whenever you tries to login.