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I would really love for you to prove that FB or any other website for that matter can sniff the site traffic of any other window or tab that you have open, when

I would really love for you to prove that FB or any other website for that matter can sniff the site traffic of any other window or tab that you have open, when you are logged into facebook on another window/tab. Cookies and history are locked by domain, plain and simple. Unless you have a conspiracy that FB is planting spyware on peoples computers.

Tichy 14y ago
Almost every web site has a Facebook button. That's how they do it. There is also the possibility of web site owners cooperating on the server side to track users. Maybe not as common yet, but not inconceivable.