Zemanta related posts plugin.
https://wordpress.org/plugins/related-posts-by-zemanta/
Widgets · WordPress Plugins
Get access to data on 35,425 websites that are Related Posts by Zemanta for WordPress Customers. We know of 8,061 live websites using Related Posts by Zemanta for WordPress and an additional 27,364 sites that used Related Posts by Zemanta for WordPress historically and 3,876 websites in the United States.
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Get a list of 35,425 websites using Related Posts by Zemanta for WordPress which includes location information, hosting data, contact details, 8,061 currently live websites and an additional 2,256 domains that redirect to sites in this list. 27,364 sites that used this technology previously and 3,876 websites in the United States currently using Related Posts by Zemanta for WordPress.