"Demystifying Mastodon and the Fediverse: Threads' Handy Explainer"

Instagram's Threads app is preparing an explainer on the "fediverse" and how apps like Mastodon work. The app will support ActivityPub, allowing Threads users to connect with Mastodon users. The explainer compares the fediverse to using email, where users can choose their preferred service and still interact with others. However, initially, private accounts on Threads will not be able to follow or interact with Mastodon and other fediverse platforms. Additionally, posts with restricted replies will not be visible outside of Threads due to limited support from other fediverse services.