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  What are effective features to identify bullying messages?

We will explore particular features in tweets as well as tweet metadata to find features that automatic analysis might not.

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  Are they useful in selecting data from twitter to train on?

Taken as an absolute, not a high proportion of messages on twitter is bullying. If we can filter data from twitter before analyzing it, we might retrieve more examples of bullying. This would aid in classifying.

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  What are good classifier algorithms and parameters for this task?

There are many different classification methods. We can compare them to find the most suited one.