Blocklist (Bluesky)
Bluesky feature: shared blocklists that users can subscribe to. Maintainer curates list of problem accounts; subscribers inherit automatically. Pioneer concept in mainstream social media — Twitter/Mastodon only had private blocks.
Implementation: AT Protocol "labelers" — services that annotate accounts, users opt-in to respect labels. Classic use: "block all known harassers in X community", "block evangelical accounts", "block bots". Trade-off: powerful tool but risk of echo chambers + collateral damage (legit accounts mass-blocked). Twitter Block Party (old 3rd-party tool) did similar but had to shut down after Twitter API change 2023. Bluesky: blocklist creator can rank as "influencer" on their moderation.