WordPress Share Buttons Plugin from AddThis
https://wordpress.org/plugins/addthis/
Widgets · WordPress Plugins
Get access to data on 159,396 websites that are AddThis for Wordpress Customers. We know of 134,557 live websites using AddThis for Wordpress and an additional 24,839 sites that used AddThis for Wordpress historically and 77,388 websites in the United States.
Get a list of 159,396 websites using AddThis for Wordpress which includes location information, hosting data, contact details, 134,557 currently live websites and an additional 101,908 domains that redirect to sites in this list. 24,839 sites that used this technology previously and 77,388 websites in the United States currently using AddThis for Wordpress.