"The ubiquity of multiplex workplace friendships warrants a deeper investigation of their effects on individuals’ performance at work. Indeed, McEvily and colleagues (2014) argue that “the more we attempt to disentangle formal [interaction] and informal [interaction] in an effort to understand their unique effects, the less we learn about how they actually operate” (p. 333) and call for investigations “where multiplexity of interactions is not just a possibility, but rather is an essential and defining feature” (p. 335) of theory and research. Here, we address this issue by exploring how and why multiplex workplace friendships uniquely influence performance."