nk497 writes "Tim Berners-Lee, the creator of the web, has challenged users to improve social networks. He describes Twitter users as 'foaming at the mouth' and unwilling to retweet any update that wasn't offering an extreme opinion. 'How do you design a form of Twitter, how do you change the retweet system, so that Twitter will end up gathering a body of reasoned debate?' he asked. He noted that Facebook-style networks kept users within their existing friend groups, and didn't 'stretch' them to meet new people. Berners-Lee asked how can we 'make use of the web so it connects people together and breaks down barriers more than it builds them up.' Any ideas?"