SEO based plugins from Yoast.
https://yoast.com/wordpress/seo/
Widgets · WordPress Plugins
Get access to data on 20,319,623 websites that are Yoast Plugins Customers. We know of 10,223,996 live websites using Yoast Plugins and an additional 10,095,627 sites that used Yoast Plugins historically and 1,376,868 websites in the United States.
Get a list of 20,319,623 websites using Yoast Plugins which includes location information, hosting data, contact details, 10,223,996 currently live websites and an additional 1,417,924 domains that redirect to sites in this list. 10,095,627 sites that used this technology previously and 1,376,868 websites in the United States currently using Yoast Plugins.
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