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For example, we want to differentiate people who followed our daily product email blast. I could use the product ID for utm_content, but it would be easier to read to use the SEO friendly URL path, such as: http://www.oursite.com/products/really-great-new-product

https://www.frugg.com/? utm_source=a&utm_medium=b& utm_term=c& utm_content=Can-I-use-a-really-long-content-tag-like-this-one-or-is-this-going-to-break-something& utm_campaign=d

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If utm_content is a URI, then the according to RFC 2616 they can be any length (however URIs over 255 bytes in length may cause issues for older browsers and proxies). In reality, most browsers can't process URIs over 2000 characters in length.

See this answer for more details on the subject of URI length:

http://stackoverflow.com/a/417184/557748

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