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"Social web platforms don't thrive by magic. They can succeed only if they attract the right individuals, motivate them to act in the right ways and empower them to know and trust others in the network. That's where online reputation systems come in."

households spend more than half of 1 percent of their time online at Wikipedia. The site produces nothing pecuniary owing to its ban on advertising. Yet, it is clearly preferred by many readers, at least judging by the declines in both MSN's Encarta and traditional encyclopedias. Because household revenue for access comes in at more than $35 billion, a reasonable first guess puts Wikipedia's value at more than $175 million in unmeasured revenue a year in US GDP.

Back to the Future, from economy 1.0 to 3.0

"Proposes a framework to explain a collaborative learning process in a community of practice as it interacts with social networking tools. The framework begins with tools and continues through five phases of a learning process and ends with socially-mediated meta-cognition."