Yowsah! Ya try to do something simple on Facebook and whadda you get? Another day older and deeper in debt ...
I wanted to get my Facebook notifications as an RSS feed, instead of e-mail messages. Facebook help has nothing; help for RSS leads to info on "subscriptions". No help. Googling gets ways to construct an RSS feed link using the "user ID" (not trivial to find. It's at <https://graph.facebook.com/[your Facebook account name]> if you want to play with it.), but they all give the error message "This feed URL is no longer valid. Visit this page to find the new URL, if you have access: ", which leads back to your timeline page. Not helpful.
The alternative was to use an "app", which has access to all your information. One site had instructions for *writing* a trivial app, which was interesting but 'way too much work.
Finally got it. Go to the page <https://www.facebook.com/notifications> and you'll see a list of all your Facebook notifications. And right there at the top of the list is a "Get notifications via:" link, with an RSS option. Works!
Note to the Facebook folks -- when you update features, you also have to update the docs and the configuration screens. The "Get notifications via:" link should be on the Notifications configuration page, for example.
Saint Peter, doncha call me, I can't go, I owe my soul to Mark Zuckerberg.
Nah. Doesn't scan. Or rhyme. Or make sense. Whatever.