Nice work. I started working on something similar, but my use case is slightly different (but the solution is similar). We all are interested in certain topics, there is a lot of content that gets published and our time is limited, so we need something that helps us identify top 10 articles or so per topic. This is why most of us like HackerNews. I think HackerNews by topic or interest would be a good idea to implement (but along with users posting links, it can come from crawling few sites as well)