Facebook oversight lets others find you by guessing phone numbers
 

Just because you mark some of your Facebook data as private doesn't mean that you're hard to track down. Software engineer Reza Moaiandin has learned that it's possible to scoop up the public details of legions of Facebook users simply by guessing...

http://www.engadget.com/2015/08/10/f...cid%3Drss_semi