document: Homepage live : automatic block tracing for web personalization The emergence of personalized homepage services , e.g. personalized Google Homepage and Microsoft Windows Live , has enabled Web users to select Web contents of interest and to aggregate them in a single Web page . The web contents are often predefined content blocks provided by the service providers . However , it involves intensive manual efforts to define the content blocks and maintain the information in it . In this paper , we propose a novel personalized homepage system , called . Homepage Live. , to allow end users to use drag-and-drop actions to collect their favorite Web content blocks from existing Web pages and organize them in a single page . Moreover , Homepage Live automatically traces the changes of blocks with the evolvement of the container pages by measuring the tree edit distance of the selected blocks . By exploiting the immutable elements of Web pages , the tracing algorithm performance is significantly improved . The experimental results demonstrate the effectiveness and efficiency of our algorithm .
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