When you read the post, you know that XMPP has all the technical parts to fill the role here. There are some people who build things on top of XMPP, but I haven

When you read the post, you know that XMPP has all the technical parts to fill the role here. There are some people who build things on top of XMPP, but I haven't seen something as advanced as buddycloud (http://buddycloud.com/ http://buddycloud.com/) here. They have a concept of "channels" (https://xmpp.org/extensions/inbox/buddycloud-channels.html https://xmpp.org/extensions/inbox/buddycloud-channels.html) which can have multiple types with multiple participants, each having a definite role. All of the use cases in the article are (theoretically) possible with buddycloud. Technically, the standard XMPP PubSub protocol with its PEP companion could get you very far already, unfortunately there's not many clients that handle them today.