@DazRunner The For You feed is pretty simple in how we rank relevance, but we will make it more transparent and powerful by giving users the ability to give feedback (I'm not interested, I don't mind this, I really like this) and implementing keyword filters to better refine the results.
That being said, what you mentioned is something I've been considering as a separate Custom Feed feature where you can use hashtags and terms to build your own reverse-chron feed.
I'm down to chat more abt ths