• Mainline Mastodon has open issues/PRs for emoji reactions (e.g., #598 in Phanpy client, various backend requests), but no merge yet. Glitch-soc features sometimes get upstreamed, so it may come soon.
• Workarounds / mods:
• Run Glitch-soc or a fork that has reactions (e.g., Essem's fork mentioned in issues).
• Clients like Phanpy, Tusky forks (Husky for Pleroma), or pl-fe (Mastodon-compatible frontend) can add client-side reaction support on some backends.