Intense Debate is a sophisticated external comment system for WordPress blogs. From Automattic.
https://www.intensedebate.com
Widgets · Comment System
Get access to data on 17,982 websites IntenseDebate Customers. We know of 1,806 live websites using IntenseDebate and an additional 16,176 sites that used IntenseDebate historically and 909 websites in the United States.
Get a list of 17,982 websites using IntenseDebate which includes location information, hosting data, contact details, 1,806 currently live websites and an additional 750 domains that redirect to sites in this list. 16,176 sites that used this technology previouslyand 909 websites in the United States currently using IntenseDebate.
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