WordPress Share Buttons Plugin from AddThis
https://wordpress.org/plugins/addthis/
Widgets · WordPress Plugins
Get access to data on 168,257 websites that are AddThis for Wordpress Customers. We know of 135,482 live websites using AddThis for Wordpress and an additional 32,775 sites that used AddThis for Wordpress historically and 78,056 websites in the United States.
Get a list of 168,257 websites using AddThis for Wordpress which includes location information, hosting data, contact details, 135,482 currently live websites and an additional 103,158 domains that redirect to sites in this list. 32,775 sites that used this technology previously and 78,056 websites in the United States currently using AddThis for Wordpress.