Does Stack Overflow honor the Do not track header... or is support going to be added later? ...(it doesn't seem to honor the header at the moment).
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We do not do anything special for the proposed spec. There is no requirement anywhere that we implement anything. A bill may be passed in congress one day, who knows.
If this proposal gains tons of traction and the industry starts following this practice we will stop serving the quantcast and google analytics tracking if the header is present.
Keep in mind, the proposal says nothing about internal tracking, its about 3rd parties. You will not be able to use this header to hide your tracks we will always continue storing every hit to our sites in our mega haproxy database.
Glancing at the draft spec, Do Not Track only seems to apply to third-party tracking, such as from ad networks/servers. As such, Stack Overflow's unregistered sessions/accounts wouldn't be a violation. SO's ad network/server seems to be Adzerk. I've just asked their "Live Help", and he wasn't aware of Do Not Track (though he said he'd read up on it).