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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
you can pay for the one offered by fivefilters.org or you could use https://github.com/pictuga/morss which is open source
I don't have a facebook account myself but follow some people's publications using rssbridge (https://github.com/RSS-Bridge/rss-bridge).
I would indeed prefer that facebook provides those feeds themselves as it sometimes break because Facebook changes things (the latest breakage I encountered being Facebook replying with "You must be logged in to view this page").
What a coincidence, I just added RSS support for my open-source "blog" scaffold: https://github.com/Cristy94/markdown-blog#changelog