Interesting paper. 

I am building a model of wiki community behavior that talks in terms such as number of reads and writes under various circumstances. My model hypothesizes various mental states that are not so easily measured but might be possible to infer. I'm not far enough along to say much more about this now, except ...

In my dreams, I would find it useful to classify contributions into broad categories based on the nature of the writing such that I could get distinct counts for each. My expectation would be that this would simplify my inference of mental states, on average, even if individual classifications were not reliable.

Best regards. -- Ward