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I'm reviewing the cookies served up from my website and one of them is a first-party cookie __qca which seems to be set by Quantcast.

I'm sure this is just used for tracking, but I can't find this cookie discussed anywhere on Quantcast's website or generally on the web at all?

Can anyone provide a reference or further information on what this cookie actually does?

Thanks.

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You may want to start accepting answers if you want to encourage others to help you both now and in the future –  John Conde Oct 20 '12 at 14:10
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Quantcast's privacy policy doesn't reference the cookie by name, but it hints as to what functions it performs with cookies in general. They're quite vague about it, though, which is probably go give them the freedom to do what they want with the information they record.

The summary from Quantcast's 'log data' section is that it may use your "computer’s IP address, pixel code, referring HTTP location, current HTTP location, search string, time of the access, browser’s time, any searches made on the applicable website, and other statistics" in order to "analyze Log Data from different websites and combine it with other non Personally Identifiable Information to produce the Reports that are made available on the Quantcast.com Site, to enable web publishers and advertisers to deliver audience segments that are appropriate for their products or services."

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