Twitter list
Twitter feature: a curated list of accounts, gives a separate timeline with only those accounts chronologically. Workaround for the algorithmic feed. Power-user feature, under-discovered by mainstream users.
Launched 2009. Public lists (everyone sees, can add themselves) or private. Classic use: separate "news" from "friends" from "competitors" from "tech twitter". The only remaining chronological-feed option after Twitter's algorithm takeover. Power-Twitter workflow: 5-10 lists open in tabs, scroll manually instead of For You. X kept the feature despite Musk-era changes. Bluesky + Mastodon have the same concept (Bluesky calls them "feeds", Mastodon "lists").