Mastodon

Structurally distinct from every other entry in this category: there is no single Mastodon.com to monitor — it is federated software run independently by many operators, including several Brazil-focused instances (mastodon.com.br, masto.donte.com.br, and others). No single login URL or status page exists by design; a monitored_url, if ever added, would need to target one representative instance rather than "Mastodon" as a whole. Niche relative to Bluesky/X in Brazil but a real, actively used alternative with a documented Brazilian instance community and a public, well-documented REST API.