"Everyone has Facebook open in one of the tabs in their browser. Say you have Facebook open in one tab and Kogan.com open in another. Facebook could tell us if

"Everyone has Facebook open in one of the tabs in their browser. Say you have Facebook open in one tab and Kogan.com open in another. Facebook could tell us if you are male or female. We could then customize our site with..." How would this happen though, technically? Would the sites need to share cookies? Or would kogan users need to explicitly indicate/link their FB id to kogan, or even login with their FB id. Later, he states... "Neither Facebook nor any of its advertising partners are interested in your personal data." This is disingenuous - for the ads, he wants to know what model phone you use. Once you buy something, he then knows your address, phone number, email, c/c, and what model phone you use. He would then likely be keeping this additional factoid (your phone model) stored somewhere along with your personal data and purchase history. It sounds to me like Ruslan is looking to do something that's a bit dodgy on the privacy front.