Zemanta related posts plugin.
https://wordpress.org/plugins/related-posts-by-zemanta/
Widgets · WordPress Plugins
Get access to data on 28,600 websites that are Related Posts by Zemanta for WordPress Customers. We know of 5,187 live websites using Related Posts by Zemanta for WordPress and an additional 23,413 sites that used Related Posts by Zemanta for WordPress historically and 2,502 websites in the United States.
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Get a list of 28,600 websites using Related Posts by Zemanta for WordPress which includes location information, hosting data, contact details, 5,187 currently live websites and an additional 2,671 domains that redirect to sites in this list. 23,413 sites that used this technology previously and 2,502 websites in the United States currently using Related Posts by Zemanta for WordPress.