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They could correlate with other sites with a back-end system that shares cookie data.

• beagle3 11y ago
  That's exactly the thing, they can't. If you block 3rd party requests as intrasight (and I) do, there's no way for a back-end system to know that users of one website are users of another, short of using things like panopticlick or font-signature correlation (which are much less reliable than a cookie -- and personally I take action to make them useless).
  • mozumder 11y ago
    ??? I know who you are based on a cookie I drop on your browser (or just from your IP address) and I can share that information from my back-end to other sites.
    • beagle3 11y ago
      You can share it, of course - but, how would they correlate it with data from other websites? How can they tell that a user on your site and one on my site are one and the same? They cannot (exceptions noted above), which makes it rather useless for profiling a user