Before revision: This study provides an in-depth analysis of a Twitter dataset around AstraZeneca COVID vaccine development released as a part of Grand Challenge, North American Social Network Conference, 2021. In brief, we show : i) the presence of malicious and low credibility information sources shared on Twitter messages in multiple languages , ii) the malicious URLs, often in shortened forms, are increasingly hosted in content delivery networks and shared cloud hosting infrastructures not only to improve reach but also to avoid being detected and blocked , iii) potential signs of coordination to promote both malicious and low credibility URLs on Twitter.
After revision: We investigate the link sharing behavior of Twitter users following the temporary halt of AstraZeneca COVID-19 vaccine development in September 2020. During this period, we show the presence of malicious and low credibility information sources shared on Twitter messages in multiple languages , ii) the malicious URLs, often in shortened forms, are increasingly hosted in content delivery networks and shared cloud hosting infrastructures not only to improve reach but also to avoid being detected and blocked , iii) potential signs of coordination to promote both malicious and low credibility URLs on Twitter.