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It is our great pleasure to welcome you to the 2021 Workshop on Open Challenges in Online Social Networks - OASIS 2021, held in conjunction with the 2021 ACM Conference on Hypertext and Social Media - ACM HT 2021. The diffusion of Online Social Networks (OSNs) has had a profound effect on the way we interact and a deep impact on society and business. OSNs have helped people to communicate, breaking down the geographical barriers that restricted communication. Through social networks, virtual communication, sharing of information, community participation is possible even among people in uncomfortable conditions. Today, OSNs are one of the main parts of daily life by affecting sociality, but they are also important channels through which information travels faster than ever. Analysis of OSN can help to foresee events to manage critical scenarios. The rapid growth in popularity has opened new challenging problems which involve numerous fields in computer science. These issues have implications on social graph analysis, trust and security, and so on. Moreover, privacy issues and the usage of mobile devices has opened new research fields in the design of decentralised online social networks, which can be considered one of the most important challenges. Furthermore, the current improvement concerning the study and the proposal of new approaches for Social Networks and Media involve not only complex network analysis, and, in particular, the decentralisation of social services, but also the introduction of new AI solutions.

Online social networks

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Né à Ferrare en 1842, Giovanni Boldini, a passé la majeure partie de sa carrière dans le Paris de la Belle Époque dont il a été l’un des interprètes les plus sensibles et les plus imaginatifs. Peintre virtuose, il connaît de son vivant un succès incontestable et devient le portraitiste favori d’une clientèle riche et internationale. A l’occasion de la rétrospective au Petit Palais, cette première monographie en français consacrée à Boldini nous emmène à la découverte d’un peintre de talent et nous fait revivre le Paris mondain, artistique et littéraire du tournant du XXe siècle. Organisé de manière chronothématique, cet ouvrage présente près de deux cents peintures, éclairées par des essais de spécialistes français et italiens, ainsi que par de nombreux commentaires d’œuvres.

Painters --- Portrait painting --- Painting, Italian --- Boldini, Giovanni, --- Boldini, Giovanni --- Boldini, Giovanni. --- Art styles --- Painting --- easel paintings [paintings by form] --- portraits --- Impressionist [style] --- Paris --- Leie. --- water (een van de vier elementen). --- Latemse Groep. --- Vlaanderen.

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Painting --- easel paintings [paintings by form] --- figures [representations] --- belle époque --- landscapes [representations] --- portraits --- Boldini, Giovanni --- Nittis, de, Giuseppe --- Paris

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This book constitutes the refereed proceedings of the Third EAI International Conference on Smart Objects and Technologies for Social Good, GOODTECHS 2017, held in Pisa, Italy, November 29-30, 2017. The 38 revised full papers presented were carefully reviewed and selected from 70 submissions. The papers reflect the design, implementation, deployment, operation and evaluation of smart objects and technologies for social good. A social good can be understood as a service that benefits a large number of people in a most possible way. Some classic examples are healthcare, safety, environment, democracy, and human rights, or even art, entertainment, and communication.

Computer science. --- Special purpose computers. --- User interfaces (Computer systems). --- Application software. --- Computers and civilization. --- Computer Science. --- Computer Applications. --- Special Purpose and Application-Based Systems. --- User Interfaces and Human Computer Interaction. --- Computers and Society. --- Information Systems Applications (incl. Internet). --- Civilization and computers --- Civilization --- Application computer programs --- Application computer software --- Applications software --- Apps (Computer software) --- Computer software --- Interfaces, User (Computer systems) --- Human-machine systems --- Human-computer interaction --- Special purpose computers --- Computers --- Informatics --- Science --- Software engineering. --- Computer software engineering --- Engineering

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Iconography --- Architecture --- architecture [discipline] --- iconography --- bridges [built works] --- Palladio, Andrea --- Bassano del Grappa