Hacker News Reader

Twitter used to have that, haven't kept up with if they still do. Youtube can do it also I think in a limited way.

Twitter does not, they dropped their RSS feeds a long time ago. They still had a free API for a while so you could use a twitter-to-RSS tool but early in the Musk era the free API went away.

Yes, YouTube has RSS feeds for channels (technically I think the feed is per playlist but channels have a default playlist).

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