Wikipedia
Hubski
Hubski was built by Mark Katakowski to provide a website community for sharing thoughtful information and conversation. A month after creating the site, he was joined by Steve Clausnitzer, another Ann Arbor resident. Many people compare Hubski to Reddit, Hacker News, and other news aggregators. In addition to sharing content from around the web, users are encouraged to share their own original content. Hubski started out as a clone of Hacker News, and is still written in Arc, the dialect of Lisp created by Paul Graham.