# ActivityPub Decentralized Social Network

ActivityPub protocol examples for federated social networks, Mastodon compatibility, and decentralized social media

> Canonical page: https://elysiatools.com/en/samples/activitypub-samples

- **Category:** Web Standards

- **Keywords:** activitypub, federated, social network, mastodon, decentralized, fediverse, protocol

## Overview

ActivityPub protocol examples for federated social networks, Mastodon compatibility, and decentralized social media

## Examples

- **ActivityPub Hello World**: Basic ActivityPub implementation with actors, objects, activities, and federation fundamentals
- **Mastodon Compatibility Layer**: Build Mastodon-compatible instances with full ActivityPub support, timelines, and federation
- **Federation Router and Relay**: Advanced federation router with relay services, content filtering, and cross-instance communication

## When to use

- Use this sample set when you want reference inputs for ActivityPub Decentralized Social Network.
- Use it to preview output formats and compare related sample variants.

## How it works

- Open a sample entry to inspect the prepared example payload or asset.
- Compare it with related tools to understand how the workflow connects.

## Use cases

- ActivityPub Hello World
- Mastodon Compatibility Layer
- Federation Router and Relay

## Frequently asked questions

### What is included in ActivityPub Decentralized Social Network?

This page includes curated sample entries, related tools, and neighboring sample collections for ActivityPub Decentralized Social Network.

## Related tools

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- [Social Media Image Resizer](https://elysiatools.com/en/tools/social-media-image-resizer): Export one image into nine social-ready crops for Instagram, X, LinkedIn, YouTube, Facebook, Xiaohongshu, and TikTok
- [Network Packet Analyzer](https://elysiatools.com/en/tools/network-packet-analyzer): Parse pcap and basic pcapng captures, surface protocol hierarchy and session statistics, and export filtered packet summaries
- [Social Media Safe-Zone Preview](https://elysiatools.com/en/tools/social-media-caption-crop-preview): Upload one image and preview how it appears on Instagram Feed/Story/Reels, TikTok, YouTube, X, and LinkedIn — with platform safe-zone overlays showing exactly which pixels get cropped or covered by UI before you publish.
- [Social Media Image Size Cheatsheet](https://elysiatools.com/en/tools/social-media-image-size-cheatsheet): A curated 2026 reference of image dimensions for Instagram, Facebook, X, LinkedIn, YouTube, TikTok, Pinterest and WeChat — filterable by platform.
- [GraphML / GEXF / Edge List Network Converter](https://elysiatools.com/en/tools/graphml-gexf-edge-list-network-converter): Convert GraphML, GEXF, DOT, adjacency matrices, and edge-list CSV with network metrics and preview
- [PERT Network Analyzer (Expected Duration & Variance)](https://elysiatools.com/en/tools/pert-network-analyzer): Three-point PERT estimates: te and σ² per activity, critical path, expected project duration and variance, and normal completion probability for a target time.
- [SERP & Social Preview Studio](https://elysiatools.com/en/tools/serp-social-preview-studio): Preview Google SERP (pixel-accurate desktop & mobile truncation), X (Twitter) Card, and OpenGraph card side by side, with pre-launch SEO diagnostics

## Related content

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