This special issue is dedicated to the best selected papers from WISE 2018. The main topic of the conference and this special issue is Web Engineering in the Era of Big Data and Artificial Intelligence (AI). This special issue focuses on selected problems in Web Engineering, a multidimensional area that involves big data, security, search algorithms, Internet of things, and data mining. Seven top ranked papers out of 48 full papers at WISE 2018 have been selected for the special issue of World

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... ide Web Journal (WWWJ). The selected papers underwent a rigorous extra refereeing and revision process. In particular, the issues papers have been extended with at least 30% new and unpublished material. Note that, adding more related work or extending the introduction was not considered in the 30%; rather the new content often includes more technical and implementation details, improved algorithms, more experiment results, etc. A total of 209 research papers were submitted to the conference for consideration, and each paper was reviewed by at least three reviewers. Finally, 48 submissions were selected as regular papers (with an acceptance rate of 23% approximately), plus 21 as short papers. The research papers cover the areas of blockchain, security and privacy, social networks, microblog data analysis, graph data, information extraction, text mining, recommender systems, medical World Wide Web