RSS Aggregation stats from Google, previously Feedburner.
https://feedburner.com
Syndication Techniques
Get access to data on 196,431 websites Google FeedProxy Customers. We know of 3,832 live websites using Google FeedProxy and an additional 192,599 sites that used Google FeedProxy historically and 2,581 websites in the United States.
Get a list of 196,431 websites using Google FeedProxy which includes location information, hosting data, contact details, 3,832 currently live websites and an additional 3,674 domains that redirect to sites in this list. 192,599 sites that used this technology previouslyand 2,581 websites in the United States currently using Google FeedProxy.
Countries
Financial
Group
Region