Allows people to recommend/send your WordPress blog's post/page to a friend.
https://wordpress.org/plugins/wp-email/
Widgets · WordPress Plugins
Get access to data on 55,357 websites that are WP-Email Customers. We know of 12,006 live websites using WP-Email and an additional 43,351 sites that used WP-Email historically and 7,387 websites in the United States.
Get a list of 55,357 websites using WP-Email which includes location information, hosting data, contact details, 12,006 currently live websites and an additional 20,606 domains that redirect to sites in this list. 43,351 sites that used this technology previously and 7,387 websites in the United States currently using WP-Email.