The website uses the FeedBurner widget to display how many readers of its RSS feeds they have.
http://feedburner.com
Widgets
Get access to data on 125,811 websites that are FeedBurner Widgets Customers. We know of 15,804 live websites using FeedBurner Widgets and an additional 110,007 sites that used FeedBurner Widgets historically and 10,065 websites in the United States.
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Get a list of 125,811 websites using FeedBurner Widgets which includes location information, hosting data, contact details, 15,804 currently live websites and an additional 8,412 domains that redirect to sites in this list. 110,007 sites that used this technology previously and 10,065 websites in the United States currently using FeedBurner Widgets.