Prove that the visitor is a human being and not a spam robot.
https://wordpress.org/plugins/wp-captcha
Widgets · WordPress Plugins
Get access to data on 20,959 websites WP Captcha Customers. We know of 13,245 live websites using WP Captcha and an additional 7,714 sites that used WP Captcha historically and 4,721 websites in the United States.
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Get a list of 20,959 websites using WP Captcha which includes location information, hosting data, contact details, 13,245 currently live websites and an additional 6,496 domains that redirect to sites in this list. 7,714 sites that used this technology previouslyand 4,721 websites in the United States currently using WP Captcha.
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