We use a dataset of email communication to document the
formation of social relationships between students in a
prestigious MBA program. First, we analyze how new
relationships form day by day during students' time in the
program. Our dataset starts before students' arrival on
campus and it offers an unique opportunity to understand the
inception of a social network. Second, we examine how
students' social connections affect their financial
donations to the school at the time of graduation.
Especially, we highlight how clustering and network turnover
influence students' integration in the MBA community and
subsequently their donations.