iPad app mentioned in Twitter App Card.
https://dev.twitter.com/cards/types/app
Mobile
Get access to data on 299,215 websites Twitter App Card iPad Customers. We know of 85,780 live websites using Twitter App Card iPad and an additional 213,435 sites that used Twitter App Card iPad historically and 55,324 websites in the United States.
Get a list of 299,215 websites using Twitter App Card iPad which includes location information, hosting data, contact details, 85,780 currently live websites and an additional 95,597 domains that redirect to sites in this list. 213,435 sites that used this technology previouslyand 55,324 websites in the United States currently using Twitter App Card iPad.
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