Khürt, based on what I can tell, it works for both public posts as well as posts your friends make which include their friends. For someone to extract your posts from Facebook they’d need part of your cookie signature which is roughly equivalent to a password. Since the particular cookies used expire within a month, you need to renew them to keep the feed alive. If you have questions about specifics, try Ryan Barrett who built it. That page also has a link to the source code and additional details as well as similar means for extracting feeds for Twitter, Instagram, and Google+.

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