Fun fact: the eigenvector centrality computation in PageRank was originally used for citation networks many years before PageRank. A surprising number of web s

Fun fact: the eigenvector centrality computation in PageRank was originally used for citation networks many years before PageRank. A surprising number of web spam problems have parallels in academic publishing: spam rings, "rich get richer" problems caused by paper search engines, and outright demands for self-citations from editors to boost a journal's impact factor.