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Issue No. 06 - June (2013 vol. 25)
ISSN: 1041-4347
pp: 1293-1306
Jingtian Jiang , University of Science and Technology of China, Hefei
Xinying Song , Harbin Institute of Technology, Harbin
Nenghai Yu , University of Science and Technology of China, Hefei
Chin-Yew Lin , Microsoft Research Asia, Beijing
In this paper, we present Forum Crawler Under Supervision (FoCUS), a supervised web-scale forum crawler. The goal of FoCUS is to crawl relevant forum content from the web with minimal overhead. Forum threads contain information content that is the target of forum crawlers. Although forums have different layouts or styles and are powered by different forum software packages, they always have similar implicit navigation paths connected by specific URL types to lead users from entry pages to thread pages. Based on this observation, we reduce the web forum crawling problem to a URL-type recognition problem. And we show how to learn accurate and effective regular expression patterns of implicit navigation paths from automatically created training sets using aggregated results from weak page type classifiers. Robust page type classifiers can be trained from as few as five annotated forums and applied to a large set of unseen forums. Our test results show that FoCUS achieved over 98 percent effectiveness and 97 percent coverage on a large set of test forums powered by over 150 different forum software packages. In addition, the results of applying FoCUS on more than 100 community Question and Answer sites and Blog sites demonstrated that the concept of implicit navigation path could apply to other social media sites.
Indexes, Crawlers, Layout, Message systems, Training, Navigation, Software packages, URL type, EIT path, forum crawling, ITF regex, page classification, page type, URL pattern learning

C. Lin, N. Yu, X. Song and J. Jiang, "FoCUS: Learning to Crawl Web Forums," in IEEE Transactions on Knowledge & Data Engineering, vol. 25, no. , pp. 1293-1306, 2013.
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