ActivityPub is a W3C Recommendation — a decentralized social networking protocol based upon the [ActivityStreams] 2.0 data format. It provides a client-to-server API for creating, updating and deleting content, as well as a federated server-to-server API for delivering notifications and content.
Zstd — a real-time compression algorithm, providing high compression ratios. It offers a very wide range of compression / speed trade-off, while being backed by a very fast decoder. It also offers a special mode for small data, called dictionary compression, and can create dictionaries from any sample set. Zstandard library is provided as open source software using a BSD license. (via Frank Denis)
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