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I was just checking what items were downloaded by the SO pages, and I saw pixel.quantserve.com popping up. My first instinct was to block it using Adblock Plus, but I'd like to know what it's for.

Any reason not to block "http://*.quantserve.com/" ??

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actually, this never finished downloading for me and the page just remains with a permanent download status bar. –  Dimitar Christoff Dec 6 '10 at 12:37
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2 Answers

up vote 15 down vote accepted

Quantserve is like Google Analytics, but totally public.

(this is important to attract advertisers, as they see your public validated traffic rank and have some idea of the type and number of visitors they might be advertising to)

http://www.quantcast.com/stackoverflow.com

I wish Google Analytics offered a world-public view into your web stats and we wouldn't need Quantserve..

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Is there a link to seeing the public SO traffic rank? Just curious... –  Roddy Jul 16 '09 at 11:44
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Doesn't GA have an API for this? –  Shog9 Jul 16 '09 at 17:35
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@Jeff Atwood quantserve is currently crippling all StackExchange sites for me - every page takes 20+ seconds to load as it hangs on edge.quantserve.com :( –  MattDavey Nov 9 '11 at 10:23
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Noscript blocks it as a matter of course, so I guess you are losing quite a bit of data. Certainly more than a site with 'average' users!

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This is true. I have Noscript set to block all quantserve.com traffic. –  tj111 Jul 16 '09 at 14:47
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