It&#x27;s generally understood that it&#x27;s quite effective to advertise to prior customers compared to say, targeting a geographic area.<p>Apparently it&#x27;s about as effective as search ads: <a href="http:&#x2F;&#x2F;venturebeat.com&#x2F;2014&#x2F;12&#x2F;16&#x2F;90-of-marketers-say-retargeting-now-as-good-as-search-ads-email-marketing&#x2F;" rel="nofollow">http:&#x2F;&#x2F;venturebeat.com&#x2F;2014&#x2F;12&#x2F;16&#x2F;90-of-marketers-say-retarg...</a>