From As Tag Service Expands, San Diego’s Tealium Secures $20M Financing:

Tag Map (Wiki commons map created by Luca Cremonini from image by Markus Angermeier)
Tag Map (Wiki commons map created by Luca Cremonini from image by Markus Angermeier)

(Tag Map, credit: Wiki commons map created by Luca Cremonini from image by Markus Angermeier)

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