how to show google ads appear only once per visitor?
is there any script to do that?
I heard Google controls the running ads totally. The publisher can't change the ads, but can filter the ads.
use an AdServer like DFP Small Business and enable frequency capping
how much does that cost? how to get it? can provide more info?
Here you go: How to set up DFP Small Business for serving Ads on your sites
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