WordPress anti-spam plugin that eliminates comment spam, trackback spam, contact form spam & registration spam.
https://wordpress.org/plugins/wp-spamshield/
Widgets · WordPress Plugins
Get access to data on 283,453 websites that are WP-SpamShield Anti-Spam Customers. We know of 81,763 live websites using WP-SpamShield Anti-Spam and an additional 201,690 sites that used WP-SpamShield Anti-Spam historically and 48,315 websites in the United States.
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Get a list of 283,453 websites using WP-SpamShield Anti-Spam which includes location information, hosting data, contact details, 81,763 currently live websites and an additional 39,314 domains that redirect to sites in this list. 201,690 sites that used this technology previously and 48,315 websites in the United States currently using WP-SpamShield Anti-Spam.