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 131,569 websites that are FeedBurner Widgets Customers. We know of 18,646 live websites using FeedBurner Widgets and an additional 112,923 sites that used FeedBurner Widgets historically and 11,973 websites in the United States.
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Get a list of 131,569 websites using FeedBurner Widgets which includes location information, hosting data, contact details, 18,646 currently live websites and an additional 12,864 domains that redirect to sites in this list. 112,923 sites that used this technology previously and 11,973 websites in the United States currently using FeedBurner Widgets.