We give counterexamples to a conjecture of Benny Chor and another of the second author, both from the late 80s, by exhibiting functions for which the influences of large coalitions are unexpectedly small relative to the expectations of the functions.

—Blogging is a popular way of expressing opinions and discussing topics. Bloggers demonstrate different levels of commitment and most interesting are influential bloggers. Around such bloggers, the groups are forming, which concentrate users sharing similar interests. Finding such bloggers is an important task and has many applications e.g. marketing, business, politics. Influential ones affect...

OBJECTIVE Online health communities (OHCs) have become a major source of support for people with health problems. This research tries to improve our understanding of social influence and to identify influential users in OHCs. The outcome can facilitate OHC management, improve community sustainability, and eventually benefit OHC users. METHODS Through text mining and sentiment analysis of user...

Blogging is a popular activity with high impact on marketing, shaping public opinions, and informing the world about major events from a grassroots point of view. Influential bloggers are recognized by businesses as significant forces for product promotion or demotion, and by oppressive political regimes as serious threats to their power. This paper studies the problem of identifying influentia...

h-index has become the most popular indicator for quantifying a scientist’s scientific impact in various scientific fields. h-index is defined as the largest number of papers with citation number ≥ h and it treats each citation equally. However, different citations usually come from different papers with different influence and quality, and a citation from a highly influential paper is a greate...

Identifying social influence in networks is critical to understanding how behaviors spread. We present a method that uses in vivo randomized experimentation to identify influence and susceptibility in networks while avoiding the biases inherent in traditional estimates of social contagion. Estimation in a representative sample of 1.3 million Facebook users showed that younger users are more sus...

What characterizes influential users in online health communities (OHCs)? We hypothesize that (1) the emotional support received by OHC members can be assessed from their sentiment expressed in online interactions, and (2) such assessments can help to identify influential OHC members. Through text mining and sentiment analysis of users’ online interactions, we propose a novel metric that direct...

conclusions this study highlighted the influential factors that could produce role conflict for nursing faculty members. the results can help university leaders to improve nursing faculty working conditions. results the three following categories emerged from data analysis: “roles interference”; “role ambiguity”, and “conflicting expectations”. the main theme was “working in conflict climate”. ...