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RESUMEN Este trabajo investiga la movilidad a los campos universitarios en el Área Metropolitana de Madrid a partir de datos geolocalizados de Twitter, aprovechando su alto uso por la población joven. A partir de la identificación de usuarios de Twitter, de sus campus y lugares de residencia, se estiman áreas de influencia de las distintas universidades, y se combinan los datos obtenidos con otras fuentes como ficheros de tiempos de viaje o datos de nivel de renta para analizar tiempos según modo de transporte y tipo de universidad. Los resultados muestran que los estudiantes tienden a residir cerca del campus al que asisten y la tendencia de los estudiantes de universidades privadas a residir en las zonas con mayor nivel de renta.

Recent progress in computation and the spatio-temporal richness of data obtained from new sources have invigorated Time Geography. It is now possible to visualise and represent movements of people in a dual spatial-temporal dimension. In this work, we use geo-located data from the social media platform Twitter to show the value of new data sources for Time Geography. The methodology consists of visualising space-time paths in 2D and 3D in four study zones, with different land-use profiles, based on tweets compiled over the course of two years. The results provide a view of behaviours occurring in the areas of study throughout the day, with complementary data to show the population's main activity at different times.

Public transport requires constant feedback to improve and satisfy daily users. Twitter offers monitoring of user messages, discussion and emoticons addressed to official transport provider accounts. This information can be particularly useful in delicate situations such as management of transit operations during the COVID-19 pandemic. The behaviour of Twitter users in Madrid, London and Prague is analysed with the goal of recognising similar patterns and detecting differences in traffic related topics and temporal cycles. Topics in transit tweets were identified using the bag of words approach and pre-processing in R. COVID-19 is a dominant topic for both London and Madrid but a minor one for Prague, where Twitter serves mainly to deliver messages from politicians and stakeholders. COVID-19 interferes with the meaning of other topics, such as overcrowding or staff. Additionally, specific topics were discovered, such as air quality in Victoria Station, London, or racism in Madrid. For all cities, transit-related tweeting activity declines over weekends. However, London shows much less decline than Prague or Madrid. Weekday daily rhythms show major tweeting activity during the morning in all cities but with different start times. The spatial distribution of tweets for the busiest stations shows that the best-balanced tweeting activity is found in Madrid metro stations.