So Lee wrote “FBStalker,” a Python script he and Werrett debuted Thursday at the Hack in the Box security conference in Kuala Lumpur. In its current form, FBStalker runs in the Chrome browser on OS X, entering queries into Facebook’s Graph Search and pulling data. They used FBStalker in the attack against the man in Hong Kong.

Even if a person’s profile is locked down to strangers, their friends’ open profiles can be examined, giving an indication, for example, who the person may be close with. FBStalker uses Graph Search to find photos in which two people are tagged in, comments on profiles and more.

via Facebook ‘stalker’ tool uses Graph Search for powerful data mining – security, HITB, Facebook – Computerworld.