They probably check for a cookie that would be blocked by your ad filter.
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Anonymous2008-06-10 16:18
I block all cookies.
The question is, if I use an adblocker who downloads all files normally but filters them AFTER they are downloaded, can the advertiser know if I see the ad or not? Probably not.
How does ABP work? Does it filter the files on my PC or does it scan the request and just not download the file if it is ad? I guess the latter means the advertiser knows I blocked him.
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Anonymous2008-06-10 16:37
They could use javascript to query the DOM and see what has been made invisible.
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Anonymous2008-06-10 16:41
>>6
That is interesting. Do you have any knowledge how this is done or know a website that explains it a bit? :)
Of course, I use noscript. ;)
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Anonymous2008-06-10 16:42
it block e.g. running some javascript. in the file containing the ads, you just have to set the var showad=1; and later you can check it.
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Anonymous2008-06-10 18:04
bump
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Anonymous2008-06-10 18:11
>>1
Sometimes the js/image showing the ad doesn't even get downloaded. It depends on how the block is done.
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Trollbot90002009-07-01 9:34
Them Trust me it is how can anyone use it with types other.