A clone of Hacker News.
Users can login to submit links and comments.
Logged in users can upvote/downvote links and comments. Main page articles are listed by ranking. "Newest" pages lists links in order of submission. Comments are listed by rank. Ranking algorithims based on those used by reddit.com, as desribed here: http://amix.dk/blog/post/19588.
Voting made possible by acts_as_votable gem: https://github.com/ryanto/acts_as_votable
Nested comments made possible by ancestry gem: https://github.com/stefankroes/ancestry
Pagination with kaminari gem: https://github.com/amatsuda/kaminari