The associated article has been retracted over concerns relating to irregularities found in the raw data. Concerns relating to the data can be found in the retraction notice: https://www.journals.uchicago.edu/doi/abs/10.1086/708066 The social niche specialization hypothesis predicts that animal personalities emerge as a result of individuals occupying different social niches within a group. Here we track individual personality and performance, and collective performance among groups of social spiders where we manipulated the familiarity of the group members. We show that individual personalities, as measured by consistent individual differences in boldness behavior, strengthen with increasing familiarity, and that these personalities can ...