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We also define the concept of web spam numerically and provide a brief survey on various spam forms. In turn, we perform a subcategorization of link-based category into five groups based on ideas and prin-ciples used: labels propagation, link pruning and reweight-ing, labels refinement, graph regularization, and feature-based. We categorize all existing algorithms into three categories based on the type of information they use: content-based methods, link-based methods, and methods based on non-traditional data such as user behaviour, clicks, HTTP sessions. In this paper we present a systematic review of web spam de-tection techniques with the focus on algorithms and under-lying principles. Over the last decade research on adversarial information retrieval has gained a lot of interest both from academia and industry. Moreover, spam evolves that makes the problem of provid-ing high quality search even more challenging. Though due to web spam phe-nomenon, search results are not always as good as desired. Search engines became a de facto place to start information acquisition on the Web. Is facilitated by youth protection laws that cannot yet accommodate the interactive andĬommunicative risks associated with such games and by a lack of knowledge of parentsĪnd the social institutions about this medium. Both types of offenders take advantage of the specifics of virtual worldsįor instance to entice children to commit sexual acts in return for virtual goods. The blackmailer type who acts openly and the good-friend type who acts in aĬonspiratorial way. Interactive experience to initiate sexual contact with minors. A fraction of them use this anonymity and intimate Virtual worldsīring together people of all ages and gender in playful interaction without them ever knowingĮxactly who the other players are. In Germany, 16 million people are already playing online games. In its heyday, the well-known online game World of Warcraft alone attracted 12 million
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Virtual worlds and online games in particular are played by more and more people every