An increasingly popular trend in online businesses is the adoption of the freemium model, in which premium features are provided along with free features. By providing free features to a large fraction of users and by managing the social interactions between users and their friends, online...

Continued use of retracted articles amplifies the adverse consequences of propagating questionable knowledge. Because traditional approaches have not been adequate in alleviating continued use of retracted articles, scholars have called for the use of social media to aid in disseminating...