The second information which I see having potential is the EXIF of the pics, the off pixels and other identifying data of the camera (flare, blur, watermark), artificially introduced or not.<p>Not only it proves who we with whom at the same time. It also links profiles. You can create a whole new identity; but if you didn&#x27;t throw away all your phones and cameras, then Facebook can link the profiles. Or if you sell something on Craigslist and upload on Snapchat with the same camera: It&#x27;s tied to your identity.