[gojomo]

The section about "personally identifiable" information in the Google Analytics Terms of Service [1] does not limit Google, but the site using GA.

Practically, I'm not sure that can even be enforced, or that Google has any incentive to enforce it. If a site uniquely tags each user via custom variables, or by sending users to a unique resource/goal/interim URL, will Google detect this and obscure/destroy the resulting data? Or is such tracking for the site's own purposes a core feature of GA?

And Google often has its own PII about the same user, from other visits to Google's own sites, anyway.

[1] http://www.google.com/analytics/terms/us.html - section 7 "Privacy"

[zwetan]

you are allowed to uniquely identify a user with a "User ID" which is different than the "Client ID"

https://developers.google.com/analytics/devguides/collection...