Every day people create and consume massive amounts of multimedia information and data by engaging with various mobile Internet services. With a wide variety of multimedia information and data around us being aggregated over time, the Internet is getting increasingly informationcentric. We are experiencing an age of increasing demands on how we host various people’s online engagements and how to strengthen people’s lives in the physical world with more personalized smart services. One of the characteristics of multimedia information and data is that their scale is massive and requires a technological infrastructure that can accommodate rapid processing, largescale storage, and flexible analysis of multi-structured data. This workshop addresses a focused but broad research theme with an emphasis on how to manage and derive value from multimedia data in the social Internet landscape to facilitate the connections between users’ physical world and their online activities. Workshop tune covers: i) discovering user-relevant co-occurrences and associations across the Internet multimedia landscape, (ii) extracting mobile user intentions, physical context, and values of local multimedia topics and events, modeling the user-centric physical world and online activities, (iii) gaining insights and understanding of voluminous and diverse user behaviours, (iv) personalizing decisions and services, and (v) building a multimedia ecosystem for Internet-scale multimedia management.