People are increasingly searching for health information from online sources such as question-and-answer (Q&A) services. The health information obtained this way can have significant impacts on people’s health decisions and lives, but what constitutes a helpful answer in the medical domain...

A common assumption in prior research and practice is that more helpful online reviews will exert a greater impact on consumer attitudes and purchase decisions. We suggest that this assumption may not hold for reviews expressing anger. Building on Emotions as Social Information (EASI) theory, we...

Online social networks are increasingly being used to conduct commercial activities, and many online social networking platforms allow users to sell products to their online connections. Although extensive research has been conducted on the interactions among buyers within a social network,...