Comment spam prevention for blogs.
http://akismet.com
Widgets · Comment System
Get access to data on 1,180,471 websites that are Akismet Customers. We know of 254,489 live websites using Akismet and an additional 925,982 sites that used Akismet historically and 155,908 websites in the United States.
Get a list of 1,180,471 websites using Akismet which includes location information, hosting data, contact details, 254,489 currently live websites and an additional 122,289 domains that redirect to sites in this list. 925,982 sites that used this technology previously and 155,908 websites in the United States currently using Akismet.