Applications of personal knowledge graphs

Abstract

A blog post at Google on 16 May 2012 with the title "Introducing the Knowledge Graph: things, not strings" represented one of the first references concerning the current definition of Knowledge Graphs. On the other hand, the article by Krisztian Balog et al. "Personal Knowledge Graphs: A Research Agenda" represented one of the very first references clearly defining the commonalities of Personal Knowledge Graphs (PKGs) such as presenting a "Spider-Web" graph layout having as the user its "center of gravity." To date, the literature related to PKGs is currently scarce given that it is still a virgin and promising research field. In this chapter, we present a survey including a classification of different types of applications of PKGs, spanning from E-learning Systems to Personal Information Managers (PIMs), to the Decentralized Web (e.g. the "Social Linked Data" (SOLID) stack), and so on. This classification identifies nine overlapping categories given that PKGs may belong to one or more categories. In each classification, we focus/highlight common and outstanding architectural components as reference architectures for each category type. We end-up the chapter by including and suggesting a reference architecture depicting desired main components for a semantic web (SW)-based PKG.