Mining user-generated content--e.g., for the early detection of outbreaks or for extracting personal observations--often suffers from the lack of enough training data, short document length, and informal language model. We propose a novel multi-view active learning model, called Context-aware Co-testing with Bagging (COCOBA), to address these issues in the classification tasks tailored for a query word--e.g., detecting illness reports given the disease name. COCOBA employs the context of user

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... stings to construct two views. Then it uses the distribution of the representations in each view to detect the regions that are assigned to the opposite classes. This effectively leads to detecting the contexts that the two base learners disagree on. Our model also employs a query-by-committee model to address the usually noisy language of user postings. The experiments testify that our model is applicable to multiple important representative Twitter tasks and also significantly outperforms the existing baselines.