The follow-up of alumni, that is, graduates of a house of studies, is an increasingly important process in universities to maintain relationships and professional opportunities between the parties and to validate graduation profiles and other relevant factors of institutional management. Once graduated, the alumni continue their professional careers taking further training and different types of jobs, thus establishing relationships with multiple organizations in the public and private world. These interpersonal ties form social networks that can be studied using social network analysis techniques. In this article, we analyze an alumni network from the computer engineering career at a Chilean university based on data collected from the LinkedIn platform. Through the analysis techniques, it was possible to characterize the alumni network, identifying a rich diversity of behaviors with different clusters and variable patterns over time.

Disinformation is one of the main threats that loom on social networks. Detecting disinformation is not trivial and requires training and maintaining fact-checking teams, which is labor-intensive. Recent studies show that the propagation structure of claims and user messages allows a better understanding of rumor dynamics. Despite these findings, the availability of verified claims and structural propagation data is low. This paper presents a new dataset with Twitter claims verified by fact-checkers along with the propagation structure of retweets and replies. The dataset contains verified claims checked during the Chilean social outbreak, which allows for studying the phenomenon of disinformation during this crisis. We study propagation patterns of verified content in CLNews, showing differences between false rumors and other types of content. Our results show that false rumors are more persistent than the rest of verified contents, reaching more people than truthful news and presenting low barriers of readability to users. The dataset is fully available and helps understand the phenomenon of disinformation during social crises being one of the first of its kind to be released.

The influence maximization problem (IMP) and the least cost influence problem (LCI) are two relevant and widely studied problems in social network analysis. The first one consists of maximizing the influence spread in a social network, starting with a given seed size of actors; the second one consists of minimizing the seed set to reach a given number of influenced nodes. Recently, both problems have been studied together with a multi-objective metaheuristic approach. In this work, diffusion filter restrictions based on the network topology are proposed to reduce the search space and thus improving the convergence speed of the solutions. This proposal allows increasing the quality of the results. As the influence spread model, the Linear Threshold model will be used. The solution is tested in three social networks of different sizes, finding promising improvements in harder instances.