RSS Aggregation stats from Google, previously Feedburner.
https://feedburner.com
Syndication Techniques
Get access to data on 187,148 websites that are Google FeedProxy Customers. We know of 2,697 live websites using Google FeedProxy and an additional 184,451 sites that used Google FeedProxy historically and 1,748 websites in the United States.
Get a list of 187,148 websites using Google FeedProxy which includes location information, hosting data, contact details, 2,697 currently live websites and an additional 2,567 domains that redirect to sites in this list. 184,451 sites that used this technology previouslyand 1,748 websites in the United States currently using Google FeedProxy.
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