WordPress version 3.1.*
http://codex.wordpress.org/Version_3.1
Content Management System
Get access to data on 172,076 websites that are WordPress 3.1 Customers. We know of 23,790 live websites using WordPress 3.1 and an additional 148,286 sites that used WordPress 3.1 historically and 4,911 websites in the United States.
Get a list of 172,076 websites using WordPress 3.1 which includes location information, hosting data, contact details, 23,790 currently live websites and an additional 2,505 domains that redirect to sites in this list. 148,286 sites that used this technology previously and 4,911 websites in the United States currently using WordPress 3.1.
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