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AbstractThe rise of the Big Data paradigm has made it more feasible to track how personal networks evolve on social media, where auto‐generated contact records and fine‐grained temporal data sequences help capture how and when interpersonal ties and contacts change their roles. Using a sample of matched survey data and social media records, we investigated the mechanisms by which indirect contacts ("degree‐2 alters") transform into direct contacts ("degree‐1 alters") from a Facebook user's (ego's) point of view. To highlight the temporal sequences, we assigned different roles to the same alters depending on how each of them is connected with ego at different periods of time. Multilevel event history analyses pinpoint several online actions and network features of ego, degree‐1 alters, and degree‐2 alters, as the key factors that contribute to the transformation from indirect contacts into direct contacts.