Although it is well known that individuals typically draw on multiple Internet platforms to maintain their personal networks, self-report measures have hindered social scientists from gaining an in-depth understanding the potentially complex systems that people employ to maintain their personal networks and leverage information, resources, and support from them. In this paper we use data collected from an Android smartphone application that records e-mail, phone, and SMS log events, and responses to an onscreen survey inquiring about social media use and supportive exchange with particular contacts drawn from the log data. This data was collected from a sample of 310 Android phone users residing in Japan. Our descriptive analysis shows that users generally overestimate the frequency of mediated communication in self-report. Furthermore, the extent of overestimation is partially predicted by the sociability, which raises the new concern of spurious correlation.