How do question-and-answer sites compare as 2006 gives way to 2007? These are social enterprises, connecting questioners with people who answer, or arrange for replies. Wade Roush examines, rates, and ranks a bunch. The winner: Yahoo! Answers.
Notice that Google is missing, since they cut their own social answer effort. Microsoft and Amazon remain in the field as big corporate players. But they, and other, lesser known entities, lag significantly behind socially-minded Yahoo!, in Roush's estimate.
Are there any other studies in this field? Kudos to Roush for the work.