WordPress version 3.1.*
http://codex.wordpress.org/Version_3.1
Content Management System
Get access to data on 171,418 websites WordPress 3.1 Customers. We know of 15,485 live websites using WordPress 3.1 and an additional 155,933 sites that used WordPress 3.1 historically and 2,953 websites in the United States.
Get a list of 171,418 websites using WordPress 3.1 which includes location information, hosting data, contact details, 15,485 currently live websites and an additional 1,787 domains that redirect to sites in this list. 155,933 sites that used this technology previouslyand 2,953 websites in the United States currently using WordPress 3.1.
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