Features that make a distributed Internet based mechanism work – Understanding the success of Stack Overflow
The video Founders@Google Presents: The Cultural Anthropology of Stack Exchange discusses design decisions that make 'Stack Overflow' such a successful question and answer system. It is interesting because you can see how the combination of cultural, behavioral, and also technical considerations of the system make it work so well – compared to other systems with similar goals.
Recorded lectures are one of the most valuable learning tools available online. The web is full of them – starting from universities that publish full courses (see 
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