You've identified a major weakness of the study, which the authors acknowledge themselves (and then ignore when reaching conclusions). > For each month, we cla

You've identified a major weakness of the study, which the authors acknowledge themselves (and then ignore when reaching conclusions). > For each month, we classified ties as strong when they were in the top 50% of an employee’s ties in terms of hours spent communicating, and as weak otherwise. Although we have not seen strong and weak ties defined in this exact way elsewhere in the research literature on social networks, the research community has not, to our knowledge, converged on a standard way to measure tie strength.