As a general rule, the marketer with the most actionable data wins. There are many types of data but the most useful kind — the GlenGarry data — is first-party data. This article will show you how you can use the data you already have about your best (and worst) customers to improve your online marketing ROI.
http://searchengineland.com/using-first-party-data-on-google-beyond-185711
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