There's an 'Articles' feature in hubzilla which is mostly finished but disabled in the code. The only thing it's waiting on is providing summaries, after which point it will be released. An unnamed project really fucked up the ability to federate multi-media articles by usurping the summary mechanism (of not one, but two protocols) for use as content warnings and then filtering out multi-media embedded content. So these articles won't federate; but they will be interactive and easily share-able.