“…It will align with the emphasis of WSDM on practical yet principled novel models of search and data mining, algorithm design and analysis, and relevant to the topics of WSDM, including multimodal data mining, web recommender systems and algorithms, social search, mining and other applications, social network dynamics, locationbased social networks, social network analysis, theories, models and applications. e areas of interest mainly include contexts and user behaviors in recommendation, such as behavioural categories [1], article popularity [3,12], social trust [4], user activities and interactions [2,[5][6][7][8][9][10][11], and the scalability of recommender systems such as the Apache Storm-based parallel processing [2,9,13] etc. In particular, topics of interest for this workshop include (but are not limited to):…”