Security researchers revealed
that cunning can abuse the search function via telephone Facebook to "fish
out" invalid phone numbers and the names of the users account. Things get
even worse in the mobile version of the social network which allows unlimited
searches or otherwise unlimited testing...
If you associate your phone
number with your account on Facebook, the default option for who can look
through the email address or phone (Privacy Settings> How You Connect> who
can look you up using the email address or phone number you provided?) is the
'Everyone'. Even if you put 'Me only', anyone who knows your phone number can
detect your profile on Facebook.
In other words if someone put
order to detect phone numbers and their owners are very easy to do so long as
you have patience. The researcher who discovered this vulnerability released
850 phone numbers (some digits only) along with the names of their owners,
saying that even the possession of a lot more. As for Facebook, declined to
make a comment...
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