We study the endogenous dynamics of reputations in a system consisting of firms with long horizons that provide goods or services with varying levels of quality, and large numbers of customers who assign to them reputations on the basis of the quality levels that they experience when interacting...

We present an analysis of user conversations in on-line social media and their evolution over time. We propose a dynamic model that accurately predicts the growth dynamics and structural properties of conversation threads. The model successfully reconciles the differing observations that have...