Please follow the next steps to fix your problems and get a new rss link
1) Go to facebook and login.
2) Go to Privacy settings and click on "edit your settings" on the "Apps and Websites" (in the bottom).
3) Remove the "RSS News Feed Reader" app.
4) Go to RSS News Feed Reader and install the app again.
5) Next, go to code generation and generate a code.
6) Paste the Generated code on the form below.
7) Go to RSS News Feed Reader, copy the RSS URL (which not working well) and paste it on the form below.
8) Press "Fix" button and get your new RSS link :)