Embedded Tweet feature allows websites to generate copy and paste-able HTML markup to render a Tweet on any third-party website.
https://dev.twitter.com/docs/embedded-tweets
Widgets
Get access to data on 253,152 websites that are Twitter Embedded Tweets Customers. We know of 35,659 live websites using Twitter Embedded Tweets and an additional 217,493 sites that used Twitter Embedded Tweets historically and 23,387 websites in the United States.
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Get a list of 253,152 websites using Twitter Embedded Tweets which includes location information, hosting data, contact details, 35,659 currently live websites and an additional 176,057 domains that redirect to sites in this list. 217,493 sites that used this technology previously and 23,387 websites in the United States currently using Twitter Embedded Tweets.