We have come a long way from face-to-face communication to electronic communication. With mobile phones and devices, online social networks, and internet, we can connect our offline activities and experiences and share them online easily. Sensors in our phones and mobile devices collect context in order to record the activities that we do and the people that we meet. We can truly now do mobile social networking, that is, connect with people to create social networks directly through the phone, rather than connect to people indirectly by adding them on social networks on the phone, which we call social networking on mobile. This presents unique research challenges and opportunities which we introduce in this chapter, and outline the structure for the chapters in this book.
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