ActivityStreams

Is this a kind of W3C attempt to create generic WebFeeds or what Twitter etc. do?

https://www.w3.org/TR/activitystreams-core/

What is the relationship between OStatus, PumpIo and ActivityPub?

https://github.com/w3c/activitypub/issues/228

My understanding is that:

• OStatus is a decentralized social networking protocol made up of several other protocols (Atom feeds, Activity Streams, PubSubHubbub, Salmon, and WebFinger)
• GNU Social and Mastodon are two server software applications that implement OStatus
• pump.io API is an interface to the pump.io server software (Activity Streams, OAuth, Web Host Metadata)
• identi.ca is a pump.io instance (not accessible right now), GNU MediaGoblin is a server application that currently uses a pump-like API
• ActivityPub is a proposed decentralized social networking protocol
• GNU MediaGoblin is a server application that will likely implement ActivityPub

How do these protocols interoperate? Does ActivityPub completely replace OStatus, or only the Activity Streams component?

Cross-posted: https://stackoverflow.com/questions/44546232

Seems to use JSONLD