ActivityPub

ActivityPub is an open, standardized protocol that enables different social media platforms and online communities to communicate and share content with each other seamlessly. Think of it as a common language that allows services like Mastodon, PeerTube, and others to send posts, follow users, and interact across their networks, even if they are built by different organizations. This interoperability fosters a more connected and diverse online social ecosystem, empowering users to participate across multiple platforms without being locked into a single service.