Pengyuan Liu started as a postdoctoral researcher in the YLLI-project (Equality in suburban physical activity environments / Yhdenvertainen liikunnallinen lähiö (YLLI)) in January 2021. He has a computer science background — He finished his BSc in Network Engineering at the Nanjing University of Post and Telecommunication in China 2011-2015, followed by his MSc in Cloud Computing at the University of Leicester in the UK 2015-2016. After his MSc, he did his PhD in Digital Geography with a specific focus on geographical artificial intelligence (GeoAI) and user-generated content (UGC) analysis at the University of Leicester. His research focuses on exploring how the content production of UGC can inform our understanding of place representations and indicate places’ socio-economic characteristics. His research interests cover the disciplines of geographic information science, GeoAI, urban analytics and quantitative human geography. In the YLLI-project, he will contribute to the social media data analysis.