Internet Science INSCI 2017 International Workshops, IFIN, DATA ECONOMY, DSI, and CONVERSATIONS, Thessaloniki, Greece, November 22, 2017, Revised Selected Papers - Diplaris, Sotiris; Diplaris, Sotiris; Satsiou, Anna; Satsiou, Anna; Følstad, Asbjørn; Følstad, Asbjørn; Vafopoulos, Michail; Vafopoulos, Michail; Vilarinho, Thomas; Vilarinho, Thomas (Springer International Publishing : Imprint: Springer, 2018)