http://onlinelibrary.wiley.com/doi/10.1111/jcom.12123/abstract
"What Creates Interactivity in Online News Discussions? An Exploratory Analysis of Discussion Factors in User Comments on News Items"
If you have access, and can send me a PDF offline, I would be very grateful :)
Cheers,
Jonathan
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Jonathan T. Morgan
Community Research Lead
Wikimedia Foundation