Is it possible to predict the area-level prevalence of COVID-19 infections in Belgium by
analyzing self-reported symptoms on Twitter? This research project is about generating
estimates of the incidence of COVID-19 infections, at the municipality level, by using
Multilevel Regression Post-Stratification (MrP) to account for sampling biases in the social
media sample. At first, tweets are obtained from users based on keywords derived from
previous research, e.g., tweets mentioning fever, cough, loss of taste, fatigue, etc. Then, key
demographic and geographical features of interest are extracted using the M3 deep learning
pipeline, as well as simple self-reported characteristics, effectively transforming the
unstructured twitter sample into a survey-like object. Finally, based on these demographic
features and census characteristics, a mixed effects logistic regression model with
post-stratification according to the Belgian census is proposed to forecast the number of
infected individuals on a particular day. This study intends to contribute to the proof of
concept of a complete end to end pipeline to perform real time predictions of disease
prevalence at a granular level in a population using social media data.

Deze masterproef is een kwantitatieve inhoudsanalyse van polariserende reacties onder online gepubliceerde nieuwsartikels van Het Laatste Nieuws. Ze gaat na of contentmoderatie werkt als oplossing voor de polarisatietrend.