[转载]Identifying Link Farm Spam Pages

信息来源：邪恶八进制信息安全团队（www.eviloctal.com）

With the increasing importance of search in guiding today's web trac, more and more e ort has been spent to create search engine spam. Since link analysis is one of the most important factors in current commercial search engines' ranking systems, new kinds of spam aiming at links have appeared. Building link farms is one technique that can deteriorate link-based ranking algorithms. In this paper, we present algorithms for detecting these link farms automatically by rst generating a seed set based on the common link set between incoming and outgoing links of Web pages and then expanding it. Links between identi ed pages are reweighted, providing a modi ed web graph to use in ranking page importance. Experimental results show that we can identify most link farm spam pages and the nal ranking results are improved for almost all tested queries.