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I don't see 139 when I navigate the mincraftforum.net directly, but when you have 8 ad units on a page, plus site analytics and a sharing toolbar or two the 37

I don't see 139 when I navigate the mincraftforum.net directly, but when you have 8 ad units on a page, plus site analytics and a sharing toolbar or two the 37 that I see is about what i'd expect. One thing that could be happening to drive the number up in some cases is identity synchronization between advertising providers. Vendors like BlueKai share profile data about you (sites visited etc) by calling out to the domains of other partners, who redirect back with an ID appended (or vice versa). This ID match then enables out-of-band profile sync. Best spot to do this is these sites who go for ad overkill.

gyardley 14y ago
It's worth noting that the user ID sync only needs to happen once per bidder in the real-time auction that determines which ads get served - once the bidder's user ID is linked to the auction provider's user ID, no more cookies need to get set. A typical user who landed on this page as part of their normal everyday browsing wouldn't have nearly so many cookies written - because this site is being tested in isolation, it's a bit misleading. This is probably why the parent here only saw 37 cookies, vs. the tester's 139.
- bartkappenburg 14y ago
  The software acts like a first-time visitor with no set cookies and empty cache. I agree on the fact that once you're logged in, made a bid or whatever, the number of cookies written on each page load is substantially lower... :)