Pop ups to convert visitors to subscribers.
http://codecanyon.net/item/ninja-popups-for-wordpress/3476479 This is an affiliate link FYI.
Widgets · WordPress Plugins
Get access to data on 72,777 websites that are Ninja Popups for WordPress Customers. We know of 16,664 live websites using Ninja Popups for WordPress and an additional 56,113 sites that used Ninja Popups for WordPress historically and 8,349 websites in the United States.
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Get a list of 72,777 websites using Ninja Popups for WordPress which includes location information, hosting data, contact details, 16,664 currently live websites
and an additional 11,259 domains that redirect to sites in this list. 56,113 sites that used this technology previously and 8,349 websites in the United States currently using Ninja Popups for WordPress.