lucy24 - 10:37 pm on Mar 16, 2013 (gmt 0)
I gotta retract what I said about piwik. Well, half of it. Just last night I was fine-tuning a couple of Legal pages so I had to get the details hammered out.
It goes like this: My piwik installation lives at example.com and tracks visits to both example.com and example.org. Your tracking cookies-- I think it's one permanent, one session-- belong to example dot whichever-you're-currently-visiting. The supplementary do-not-track cookie belongs to example dot com.
This has the weird side effect that if you want to tell Piwik not to track you, you have to switch off your browser's third-party-cookie blocker for just a moment so the new cookie will "take". (My legal page concludes with: "You just can't win, can you?")
We won't talk about how long it took me to figure out why my newly created cookie had an expiration date in 2027 instead of the intended few months.