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Used to identify which ads campaign this referral references. Use utm_id to identify a specific ads campaign. Eg: abc.123
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Use utm_source to identify a search engine, newsletter name, or other source. Eg: google*
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Use utm_medium to identify a medium such as email or cost-per-click. Eg: cpc*
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Used for keyword analysis. Use utm_campaign to identify a specific product promotion or strategic campaign. Eg: spring_sale
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Used for paid search. Use utm_term to note the keywords for this ad. Eg: running+shoes
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Used for A/B testing and content-targeted ads. Use utm_content to differentiate ads or links that point to the same URL. Eg: logolink
