<p>Nowadays, advanced network and resource capabilities offer many benefits to platform users but also bring malicious opportunities, thus leading experts to raise awareness about malicious threats and discuss potential mitigation practices through security news. An important factor in understanding user engagement and experiences is to investigate their sentiment and interests regarding security threats and tools across online platforms. In this study, we investigate content-based factors in security news affecting user interactions through a dataset of 44,264 tweets posted by seven relevant accounts. The first goal is to discover whether the textual information hidden in security news triggers retweeting through the training and evaluation of a set of classifiers. The findings suggest that words and hashtags can be important in developing prediction mechanisms. The second goal is to distinguish topics of security news leading to relatively more user interactions than the rest, where the topics are discovered using the Non-negative Matrix Factorization algorithm. For this goal, four types of user interactions are studied both independently and aggregated using the Archetypal Analysis and Conover-Iman test, respectively. The outcomes from these two approaches suggest that hacking activities followed by learning materials and webinars should be considered the most popular topics. Overall, the discussed findings can be used to understand the interests and reactiveness of Twitter users across security news, while the framework can be studied for extracting knowledge from Twitter data.</p>