Design for two kinds of Interest - Persistent and Non persistant
I think Interests there are two types of user interests
Type 1: Persistent - Here user basically declares his interests like his favorite team or actor or politician etc .... current zed design handles this well
Type 2: Non Persistent Interest - These are based on current trends / news
Example: Tornado Irine - People want news about this to be surfaced only when this item is treding. I dont want to add Irine in my interest and later have to manually clean on my interests.
Few ideas to solve this
1. USe Thumbs up down to be integrated with tending now.
If Thumbs up previous + but trending now = Show more
Thumbs up previous + but not treading now = Show less
2. Add Thumbs up/down on each title of the top stories page, so that user can easily opt to follow a trending topic while he is skimming through the Top Stories page.