Its an interesting idea. i think the human labels for navigating might get us pretty far - more so than AI embeddings. Using some ML and NLP could clean up that feed even more. With embeddings, scale is the biggest issue. They're expensive to hold and compute with.  Bet there are open source solutions to model off of though. 

 I’m not very technical, by human labels do you mean hashtags?  They’re not used enough for this functionality 

 He means the label NIP 1985. 

 And also 1983 and 1984, of course.