
Lets say your spending thousands of dollars on advertising by doing a PPC campaign and people are clicking those links... and when they hit your server your browser passes the page your asking for (URI) and the HTTP REFERRER which is sent by your browser about where you came from (you cant even trust these they are trivial to spoof) heres the image from the wsj http://j.mp/dntZi4 you see how it identifies you? its because they dont scrub referrer and it has a
ref=profile
that means it only tells them when your on your own profile page and click on an add. They probably never thought of it... its in the HTTP protocol that all browsers and websites use and is mostly an afterthought used as a lax security measure.
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