RSS Aggregation stats from Google, previously Feedburner.
https://feedburner.com
Syndication Techniques
Get access to data on 188,384 websites that are Google FeedProxy Customers. We know of 2,742 live websites using Google FeedProxy and an additional 185,642 sites that used Google FeedProxy historically and 1,784 websites in the United States.
Get a list of 188,384 websites using Google FeedProxy which includes location information, hosting data, contact details, 2,742 currently live websites and an additional 2,720 domains that redirect to sites in this list. 185,642 sites that used this technology previouslyand 1,784 websites in the United States currently using Google FeedProxy.
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