I could be overlooking something, but beyond looking at globally shared stories, or the small section with some recommendations on the main page on the desktop site, there is no way to discover new feeds to follow.
I’m thinking something like Feedly where there’s categories, and then a list of feeds to follow.
With Newsblur I feel like it’s up to me to find feeds to bring back to it to add. And while that’s nice because it keeps me from creating an overload of feeds. I do wish there was more of a discovery element within Newsblur.