The popular perception of Twitter as a social media "echo chamber" where people only receive and retweet opinions that match their own, does not reflect the data about users' actual engagement. The average Twitter user propagates more mainstream content and follows a diverse group of users - and this has implications for social media marketing.

This is an MIT Sloan Management Review article. Google. Wikipedia. Threadless. All are platinum exemplars of collective intelligence in action. Two of them are famous. The third is getting there. Each of the three helps demonstrate how large, loosely organized groups of people can work together electronically in surprisingly effective ways -- sometimes even without knowing that they are working together, as in the case of Google. In the authors' work at MIT's Center for Collective Intelligence, they have gathered nearly 250 examples of web-enabled collective intelligence. After examining these examples in depth, they identified a relatively small set of building blocks that are combined and recombined in various ways in different collective intelligence systems. This article offers a new framework for understanding those systems -- and more important, for understanding how to build them. It identifies the underlying building blocks -- the "genes" -- that are at the heart of collective intelligence systems. It explores the conditions under which each gene is useful. And it begins to suggest the possibilities for combining and recombining these genes to not only harness crowds in general, but to harness them in just the way that your organization needs.

This is an MIT Sloan Management Review article. User-generated content platforms, open source software, crowdsourcing and knowledge markets -these are all possible only because of the "social web," the interlinked virtual universe that to so many executives seems to offer the irresistible promise of providing something -ideas, work, decisions -for (almost) nothing, if only they could manage it right. Managing it right means understanding that even though the new platforms are all about harnessing crowds and communities, in the end those crowds and communities are nothing but a sum of individuals. And your company's social web efforts will succeed only to the extent that you are able to attract good individuals, motivate them to perform good work, and empower them to get to know and trust one another enough to collaborate toward the end goals of the community. The question is, How do you do that? The answer: by capitalizing on the motivational power of in reputation -that is, by designing and building an online reputation system that triggers and nourishes the kind of web community that will serve your company's needs. Using examples such as Amazon, eBay, Epinions and Yelp, the author describes how design choices of a reputation system can profoundly affect a community's culture, making an otherwise collaborative and cordial community into a competitive and even combative space.