About the only experience I've directly had with tags has been to insert tags for Google Analytics in a couple of blogs. However, Pierre's piece piqued my curiosity so I did a bit of research to learn more about tags.
I found Ingrid Lindgren's writeup in TechCrunch about tags and Google Tag Manager particularly enlightening:
Hi Pierre, I've no reason to play around with Tag Manager as I'm not a digital marketer, but I do wonder whether this new product allows for deeper or easier analytics of the tag effectiveness -- or is it just ease of viewing and managing the tags through the GA dashboard that's the benefit?
HIPAA is supposed to protect the privacy of your medical information, but the sale of anonymized medical data and advances in analytics have made it possible for organizations to re-link your name to your private records.
Visual analytics tools, can enable non-statistician citizen data scientist to create models that use predictive or prescriptive analytics. These professionals can embed their business knowledge into the models they're testing, prototyping, or building.