Ad Impressions - How is an impression logged?

Hi everyone,

How is a single Ad impression being logged?

Does 1 impression means:
- The ad appears on a page one time. If user "A" refresh the page X times. The ad impression will be X times.


- The ad appears on the page for user "A". No matter how many times user "A" refresh the page, it is still consider as 1 impression


- The ad impression is logged by unique visitor?
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stevongAuthor Commented:
Is there an industry standard for these calculations? I can't find any in the RFC specifications
1 impression is 1 load of the ad, refresh the page impression increments by 1

If you view the page 100 times thats 100 impressions.


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