Ad Retargeting or Remarketing as Google calls it is a pretty effective Ad tactic.
If you don’t know what it is then Retargeting, in the case of Adwords, is a cookie that gets placed on your computer upon visiting a companies site that has activated remarketing in their Ad campaign, later when visiting other sites in the Google content network then Google know that you had an interest in certain sites before and will show you ads from that company again.
The main problem with many companies is they don’t set up Frequency caps, ie. how many times your ads are being shown to a site visitor.
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