A FeedBurner "User" is not equal, this was a publisher service. The real target were the feed subscribers, or maybe they are where can I check the data? The s

A FeedBurner "User" is not equal, this was a publisher service. The real target were the feed subscribers, or maybe they are where can I check the data? The same goes for Youtube, how many visitors did they have? They bring in the ad revenue. Compared to Facebook/Whatsapp where you can usually only participate by being a user.