WordPress version 3.1.*
http://codex.wordpress.org/Version_3.1
Content Management System
Get access to data on 175,232 websites that are WordPress 3.1 Customers. We know of 17,661 live websites using WordPress 3.1 and an additional 157,571 sites that used WordPress 3.1 historically and 3,326 websites in the United States.
Get a list of 175,232 websites using WordPress 3.1 which includes location information, hosting data, contact details, 17,661 currently live websites and an additional 1,934 domains that redirect to sites in this list. 157,571 sites that used this technology previously and 3,326 websites in the United States currently using WordPress 3.1.
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