Comment: not really crowdsourcing (Score 3, Insightful) 270
Crowdsourcing did not fail because what occurred was not crowdsourcing.
There is a distinction between, on the one hand, the emergent behavior which spontaneously arises from ungoverned social interaction and, on the other hand, the management practice of dividing and framing a problem such that it can be solved by large, loosely-affiliated groups of anonymous individuals working in parallel. The latter is crowdsourcing. The former, in the case of attempts to identify Boston Marathon suspects in online fora such as reddit, is a vigilante mob.
At least that interpretation is consistent with the conventional usage of the term "crowdsourcing" up to this point. Consider well-known examples such as the Mechanical Turk, the search for the wreckage of Steve Fosset's plane and prediction markets such as Iowa Electonic Markets. In all case the role of any individual in the crowd is predefined and constrained in advance by design. Constraints can include the dimension of response and the information to be evaluated.