I believe in the concept of crowdsourced recommendation engines, but I am afraid Twitter might fail at that. A great recommendation engine is tuned to what peo

I believe in the concept of crowdsourced recommendation engines, but I am afraid Twitter might fail at that. A great recommendation engine is tuned to what people like. However, that would be subjective, and solving the problem in an abstract fashion seems difficult. So with crowdsourcing you could sidestep some layers of abstraction. For example, you can crowdsource how you label and group tweets, and use that for the machine learning. But, for example, if you use crowdsourcing for removing manual tagging of data (embarrassing?) then you might make things worse.