We have been playing with Google Analytics Client ID and found that not many agencies have been using it.
The Client ID can be found in the GA cookie and Client ID is stored on the GA cookie of your website’s actual domain.
Google Analytics stores a unique identifier for every user who visits your site within a first-party cookie. This value, in GA parlance, is called the Client ID, and the name of the cookie is _ga.
Here’s what the entire cookie string looks like, with the ...