Imagine posting once and having your message reach friends on Mastodon, Bluesky, Threads, and even your own blog—without managing multiple accounts. This is the dream of the open social web, and it's closer than you think. The key lies in “bridging,” a technique that connects different social platforms so they can talk to each other. Below, we answer common questions about how to make your federated accounts work together, what tools to use, and why this matters for a more open internet.

What is cross-platform posting and why does it matter?

Cross-platform posting lets you publish content on one social service and have it automatically appear on others, even if they use different underlying technologies. For example, a Mastodon user can share a update that reaches their Bluesky followers without those followers needing a Mastodon account. This matters because it breaks down walled gardens—the intentional barriers big tech companies create to keep you locked into their platform. Instead, you take back control: your audience follows you, not the service. It also reduces the burden of posting separately to each network. Tools like Bridgy Fed make this possible by translating messages between protocols like ActivityPub (Mastodon) and the AT Protocol (Bluesky). The open web was built on such interoperability, and cross-platform posting brings that spirit back to social media.

How do ActivityPub and the AT Protocol affect interoperability?

The Fediverse (Mastodon, PeerTube, etc.) runs on ActivityPub, while Bluesky uses its own AT Protocol. These are different languages, so accounts on one can't natively follow accounts on the other. That's where a bridge comes in—a third-party tool that translates messages back and forth. Without a bridge, a Bluesky user would need to create a Mastodon account just to see your Mastodon posts, and vice versa. Bridges solve this by acting as a middleman: they follow your account on one platform, then republish your posts on the other (with proper attribution). The good news is that more bridges are appearing, making cross-platform communication simpler every day. Major blogging platforms like WordPress and Ghost already integrate with the Fediverse, proving that this approach works.

What is POSSE and how does it relate to bridging?

POSSE stands for “Publish (on your) Own Site, Syndicate Elsewhere.” It's a philosophy where you post content on a primary hub—like your personal website or a single social account—and automatically push copies to other platforms. Bridging is a key part of POSSE because it automates the syndication step. Instead of manually copying a post to Mastodon, Bluesky, Threads, and Twitter, you set up a bridge once and let it handle the distribution. This way, your content lives on your own space (giving you full control) while reaching audiences everywhere, regardless of which service they prefer. POSSE also discourages dependency on any one corporation's platform, aligning with the original vision of the open web. Many indie web enthusiasts use POSSE to maintain their digital independence.

How can I use Bridgy Fed to connect Mastodon and Bluesky?

Bridgy Fed is the simplest bridging tool currently available. To connect your Mastodon account to Bluesky, follow these steps: On your Mastodon instance, search for the username @bsky.brid.gy@bsky.brid.gy and follow that account. The bridge will automatically follow you back. From that point, any public post you make on Mastodon will be mirrored to your Bluesky account (if you have one) or made visible as a Bluesky-compatible post. You don't need to create a new Bluesky account if you don't want one—Bridgy Fed creates a “ghost” profile for you on Bluesky so your posts are discoverable there. To control what gets bridged, you can use hashtags like #nobridge to exclude a post. This method works in reverse too: you can follow Bluesky accounts from Mastodon by searching for their bridged identity.

What other bridging tools are available?

Besides Bridgy Fed, several other tools help connect federated accounts. Fedisky is another bridge that links Mastodon and Bluesky. RSS Parrot can turn RSS feeds into Fediverse posts, which is handy if you run a blog. Pinhole is a more experimental bridge that focuses on ActivityPub and the AT Protocol. Each tool has its own setup process and features, so choose based on your needs. For instance, if you want to cross-post from a WordPress blog to Mastodon, look for a plugin that uses ActivityPub directly. If you want to bridge Threads (which uses ActivityPub) to Bluesky, you'll need a bridge that supports both protocols. The landscape is evolving rapidly, so check the latest community recommendations. The goal is the same: make your voice heard everywhere without extra effort.

How can I set up automatic syndication from my own website?

If you own a personal website or blog, you can implement POSSE with tools like Bridgy (different from Bridgy Fed) or IndieWeb plugins. For example, with a WordPress site, install the ActivityPub plugin and Webmention plugin. Then configure a bridge to push new posts to Mastodon, Bluesky, or LinkedIn. Another approach: use a service like Buffer or Hootsuite to schedule and publish manually, but those don't offer true full automation. For true syndication, you want the bridge to automatically detect new content on your site and republish it. Some people set up Zapier or IFTTT triggers, but these can be unreliable. The ideal setup is a combination of: publish on your own site, use a plugin to broadcast to the Fediverse via ActivityPub, and use Bridgy Fed to extend that reach to Bluesky. This gives you maximum control and minimum friction.