nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqjd874v63430gng67kpw5m597f34dr9vr0yhkp8dkmnma8208raysyd6kk0 (nprofile…6kk0) The feed reader I use, Inoreader, has labels (but calls them folders, which is probably not a bad idea: if you call them labels people will ask you to implement folders :D) and does deduplication. I haven't tested the deduplication function of Inoreader for two different reasons: (1) it's only for paid users and I am happy with the free version, (2) I never see duplicate posts in different feeds (I do see duplicate posts within a single feed sometimes, though).
Being able to publish from your feed reader sounds intriguing. Where would those published feeds be hosted? Are you planning to add, I don't know, Wordpress integration or Micro.blog integration (both of which you mentioned)?