We received a total of 355 submissions from a diverse group of 44 countries and regions, of which 64 were accepted for full paper publication in the proceedings, thus achieving an acceptance rate of 18%. The accepted papers are from 20 different countries and represent a nice mix of academic and industrial research, making this a truly international and diverse forum. Some of the most popular research topics this year include Web search, computational advertising, recommender systems, and social networks. 
