coRank is a servce that aims to let users create sites where users can share whatever users find interesting on the web with people who value their opinion (whether users know who they are or not), and where users can also find what's interesting from people whose opinions are important to users - whether they know who users 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...!nnWhile 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 the company call, the user's sources.