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.