Events are user interactions with content that can be tracked independently from a web page or a screen load.
https://developers.google.com/analytics/devguides/collection/analyticsjs/events
Analytics and Tracking
Get access to data on 4,102,178 websites Google Analytics Event Tracking Customers. We know of 693,240 live websites using Google Analytics Event Tracking and an additional 3,408,938 sites that used Google Analytics Event Tracking historically and 321,743 websites in the United States.
Get a list of 4,102,178 websites using Google Analytics Event Tracking which includes location information, hosting data, contact details, 693,240 currently live websites and an additional 639,283 domains that redirect to sites in this list. 3,408,938 sites that used this technology previouslyand 321,743 websites in the United States currently using Google Analytics Event Tracking.
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