This reminds me of Stumbleupon[1] from back in 2005-ish. I used to love using it before they decided to pivot and remove all of the things that made it great.
Just tried findka out and going back to my comment about Stumbleupon, what I used to love the most about it was reading the reviews about the content I ^stumbled upon^ before even looking at the content. Pretty much the same manner in which most people use HN.
Additionally, reviews led to discovery of people with shared interests, when I saw the same people liking, sharing and commenting on stuff I liked. Following these people then added another layer of filtering to my ^stumbles^.
I've thought about how this relates to Stumbleupon as well. I never used it myself, but it came up while I was looking for things similar to Findka.
I'm actually just starting to implement features like these. If you make an account then go the the Account tab, you can enable a public profile like this[1]. So far I'm planning to add follow/subscribe, commentary (i.e. comment on items instead of just rating them), and showing users who've rated the same items as you.
[1] https://en.wikipedia.org/wiki/StumbleUpon