On Thursday 26 Jan 2012 11:33:14 Neil Bothwick wrote: > On Thu, 26 Jan 2012 10:07:51 +0000, Mick wrote: > > BTW, it seems to me that if you access youtube and at the same time > > search Google without being logged in to any of their portals, they > > will not be tracking your email for user profiling purposes. They may > > be logging IP addresses but it could be different users on the same IP > > address, so advertising results would not be relevant. > > They can track a lot more than IP addresses, your browser can provide a > lot of information, not just user-agent but installed fonts, plugin > information and much more. There is enough to do a damn good job of > identifying you even when your IP address changes. It is certainly simple > to see if you are one user or two.
Not necessarily without making some broad assumptions. For example two different users could be using the same machine and OS and browser; or same user could be using same machine, but different browser; or different users using different machines with same OS & browser, etc. So extrapolating the user profile from browser headers is unreliable. Of course Google may only be interested in getting right most of the time in which case they may use such info - although I have not found any references that they actually do. -- Regards, Mick
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