W ELCOME to the first issue of the IEEE TRANS-ACTIONS ON COMPUTATIONAL SOCIAL SYSTEMS (TCSS) of 2020, and Happy New Year to You! We would like to take this opportunity to express our sincere thanks to our editors, reviewers, authors, and readers for your great support and effort devoted to the TCSS, along with our best wish and hope that everyone has a happy, healthy, and fruitful 2020.In this issue, we publish eight regular articles, a brief discussion on parallel societies, and a special issue entitled "Social Sensing and Privacy Computing in Intelligent Social Systems" is published, which includes 16 articles.I would like to share some latest news of the IEEE TCSS with you. In October 2019, we completed our first five-year review cycle (2014-2018) carried out by the Periodicals Review and Advisory Committee (PRAC), and on November 21, I went to a face-to-face review in Boston, MA, USA (see Fig. 1). Our effort on the TCSS is unanimously and highly recognized by the PRAC, and they concluded that we had made a significant progress over the last two years (2017)(2018).