Impressions are usually deduped, meaning multiple impressions from the same user during the same session are just counted as one. The big ad networks are extremely careful to avoid miscounting of any sort and will generally err on the side of undercounting rather than overcounting (since telling advertisers they got more impressions or clicks than reported is way better than telling them the numbers were accidentally inflated). Of course, there’s the occasional bug, but it mostly works as expected.
Impressions are usually deduped, meaning multiple impressions from the same user during the same session are just counted as one. The big ad networks are extremely careful to avoid miscounting of any sort and will generally err on the side of undercounting rather than overcounting (since telling advertisers they got more impressions or clicks than reported is way better than telling them the numbers were accidentally inflated). Of course, there’s the occasional bug, but it mostly works as expected.
Does it also cover reloading with different ads? (such that it would count impressions for different advertisers)
I just realized you meant data deduplication instead of “not duped by you bitches anymore”