https://www.xul.fr/en-xml-rss.html
https://www.w3schools.com/xml/xml_rss.asp
However, I notice that JSON feeds are also an option and might be preferable for various reasons (i.e. Python's json module makes parsing easy, etc.):
https://www.jsonfeed.org/version/1.1/
As far as Twitter, I'm not sure it was ever that great of an information source. Musk has at least said they're trying to improve Twitter search, but who knows what it will look like. It's still pretty weak at present.
Why corporate media journalists and politicians flocked to Twitter in the past is unclear, unless that it was that Twitter's structure was deliberately designed for propaganda distribution. The low character count and leader-follower structure helps with the standard propaganda routine, which typically involves reducing complex arguments and ideas to the point that a small child could understand them, and then repeating that dumbed-down argument over and over while browbeating anyone who raises objections.