@liaizon An approach in this direction is @skohub which is based on #SKOS (which supports multilinguality) and has prototypical #ActivityPub support. (We hope to pick up development on this soon.) See e.g. our talk from #apconf2020 : https://blog.skohub.io/2020-10-09-skohub-apconf/
@acka47 @skohub oh yes exactly! how would you imagine this working across the fediverse with tagging being attached to a semantic concept? would each tag then look up a list in a #SKOS vocabulary server and then use that to see what related concepts might be there?