Alex King's ShareThis wordpress plugin which allows visitors to share content via social bookmarking sites and e-mail the post to friends.
http://www.thunderguy.com/semicolon/2007/07/30/share-this-jquery-a-wordpress-plugin/
Widgets · WordPress Plugins
Get access to data on 79,992 websites that are ShareThis Wordpress Plugin Customers. We know of 22,923 live websites using ShareThis Wordpress Plugin and an additional 57,069 sites that used ShareThis Wordpress Plugin historically and 14,953 websites in the United States.
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Get a list of 79,992 websites using ShareThis Wordpress Plugin which includes location information, hosting data, contact details, 22,923 currently live websites and an additional 16,428 domains that redirect to sites in this list. 57,069 sites that used this technology previously and 14,953 websites in the United States currently using ShareThis Wordpress Plugin.