Twitter ads conversion tracking code.
https://business.twitter.com/en/help/campaign-measurement-and-analytics/conversion-tracking-for-websites.html
Analytics and Tracking · Conversion Optimization · Conversion Tracking
Get access to data on 830,930 websites that are Twitter Conversion Tracking Customers. We know of 342,527 live websites using Twitter Conversion Tracking and an additional 488,403 sites that used Twitter Conversion Tracking historically and 156,732 websites in the United States.
Get a list of 830,930 websites using Twitter Conversion Tracking which includes location information, hosting data, contact details, 342,527 currently live websites and an additional 1,160,822 domains that redirect to sites in this list. 488,403 sites that used this technology previouslyand 156,732 websites in the United States currently using Twitter Conversion Tracking.
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