Really Simple Discovery is a way to help client software find the services needed to read, edit, or "work with" weblogging software.
https://cyber.law.harvard.edu/blogs/gems/tech/rsd.html
Syndication Techniques
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12,226,720 live sites
4,576,449 live sites
557,155 live sites
83,624 live sites
2,586 live sites
1,937 live sites
519 live sites
370 live sites
299 live sites
60 live sites
37 live sites
2 live sites
0 live sites