One of the reasons that always make me stop reading feeds is the huge amount of unread entries after some time.
A feature that I would really like to see on Feedspot is some kind of content filter. For example, I read an article, then I input if I like it or not, if I liked, I input some keywords that are related to that article. Now Feedspot would give priority to articles related to the keywords from articles that I liked before.
Anyway, it's just an ideia that I never saw on any Feed reader.
Adam Getchell commented
+1. The signal to noise ratio between topics I'm interested in and articles about those topics I don't want to read is decreasing drastically lately.
Add this filter to a feed to reduce the number of articles it ends up showing (i.e. filter as well as prioritize).