WordPress version 3.1.*
http://codex.wordpress.org/Version_3.1
Content Management System
Get access to data on 169,650 websites WordPress 3.1 Customers. We know of 14,858 live websites using WordPress 3.1 and an additional 154,792 sites that used WordPress 3.1 historically and 2,609 websites in the United States.
Get a list of 169,650 websites using WordPress 3.1 which includes location information, hosting data, contact details, 14,858 currently live websites and an additional 1,269 domains that redirect to sites in this list. 154,792 sites that used this technology previouslyand 2,609 websites in the United States currently using WordPress 3.1.
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