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New York University

Comment features allow other learners to give their opinions, suggestions, or approval of another's contribution and help develop more quality knowledge entities within the community. 

Encouraging Collaboration in Online Learning Communities through Comment features

Cobos, R., & Pifarré, M. (2008). Collaborative knowledge construction in the web supported by the KnowCat system. Computers & Education, 50(3), 962-978.

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