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 91,557 websites that are ShareThis Wordpress Plugin Customers. We know of 28,552 live websites using ShareThis Wordpress Plugin and an additional 63,005 sites that used ShareThis Wordpress Plugin historically and 18,886 websites in the United States.
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Get a list of 91,557 websites using ShareThis Wordpress Plugin which includes location information, hosting data, contact details, 28,552 currently live websites and an additional 21,813 domains that redirect to sites in this list. 63,005 sites that used this technology previously and 18,886 websites in the United States currently using ShareThis Wordpress Plugin.