Official Tweet Button for sharing articles on websites and counting how many times a URL has been shared.
https://twitter.com/about/resources/buttons#tweet
Widgets
Get access to data on 4,595,496 websites that are Twitter Tweet Button Customers. We know of 971,157 live websites using Twitter Tweet Button and an additional 3,624,339 sites that used Twitter Tweet Button historically and 420,303 websites in the United States.
Get a list of 4,595,496 websites using Twitter Tweet Button which includes location information, hosting data, contact details, 971,157 currently live websites and an additional 595,603 domains that redirect to sites in this list. 3,624,339 sites that used this technology previouslyand 420,303 websites in the United States currently using Twitter Tweet Button.
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