tt-rss.github.io/docs/Share-Anything.md

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You can share arbitrary webpages to appear as articles in your Published feed. Combined with Readability this makes tt-rss function like a read-it-later kind of website.

Sharing is available via bookmarklet in Preferences: (Feeds-→ Bookmarklets) (if you have bookmarklets plugin-enabled) or through Android application.

Since they have no actual originating feed, shared articles are placed into Archived articles feed and then set published.