1. 
   CPT - Cost per Thousand
   (Or CPM, the 'M' being the Roman numeral for 1,000) CPT is a measure of value and describes the cost of 1,000 impressions. For example, a PR campaign that achieves 750,000 impressions, with a £150,000 ACE value has a CPT of £5 (750,000 divided by £150,000).
   Found op http://www.paperclippartnership.co.uk/public-relations-definitions.html
   
   

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