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Simple enough. At least Collections/OrderedCollections can have a description (such as the summary property as mentioned in the ActivityStreams vocab spec, in an example). Hopefully I can make use of this for separating out “gallery upload” posts from microblogging posts. Although I guess it probably doesn’t have much utility since I don’t think any implementations let you follow a collection instead of an actor (or to specify what collection(s) you want to subscribe to in a Follow request? ..That would be an interesting extension..), I guess it’s still stuck to needing a ‘virtual’ actor anyway for those sort of ‘substreams’ (like PeerTube does, if I remember correctly).