coRank is a servce that lets you create sites where you can share whatever you find interesting on the web with people who value your opinion (whether you know who they are or not), and where you can also find what's interesting from people whose opinions are important to you - whether they know who you are or not. Everything on all coRank sites is submitted by their users, and after they submit a story, website, etc. other people will read it and give it a thumb up or down. If that story receives enough positive votes, it is promoted to the front page. But...! While there are other sites offering similar services, in coRank each user has their own "front page", and the stories promoted to a user's front page are determined only by the votes of the people this user has previously selected - these are what we call, the user's sources.