The present study also examined the relationships among researchers’ characteristics and each of the three activities. When the binary logistic models of participants’ seniority, discipline, frequency of RIMS use, and number of publications were regressed on whether the participants endorsed other researchers for their expertise, we found that graduate students and postdocs had higher odds of making endorsements than did full professors (χ2 = 31.29, p = 0.0005, pseudo R2 = 0.08; z > 2.40, p < 0.02). Postdocs also had higher odds of making endorsements than did associate professors (z = 2.07, p = 0.04). In addition, an increase in the number of publications and the frequency of RIMS use increased the odds of researchers endorsing others for their expertise (z > 1.90, p < 0.05; see Fig 1). No significant differences were found among field of study categories on the odds of endorsing other members for their expertise. Results from the regression analysis for the question-answering and profile-maintenance activities were not statistically significant.