Giorgio ha postato il suo caso studio sul Badrank di Google, l’algoritmo che penalizza i siti web linkati da risorse definite spam.
I brevetti uno e due definiscono gli algoritmi che penalizzano i siti web che si avvicinano alle regioni (gruppi di siti) considerate off-limits da Google stesso.
E’ quindi sconsigliato postare su siti web ma soprattutto farsi linkare da risorse che sono oggettivamente di poca utilità nella rete, oltre che creare collegamenti a (outbound link) spam engine e simili.
DEFINIZIONE DI TRUSTRANK (wikipedia)
TrustRank is a link analysis technique for semi-automatically separating useful webpages from spam.
Many Web spam pages are created only with the intention of misleading search engines. These pages, chiefly created for commercial reasons, use various techniques to achieve higher-than-deserved rankings on the search engines’ result pages. While human experts can easily identify spam, it is too expensive to manually evaluate a large number of pages.
One popular method for improving rankings is to increase artificially the perceived importance of a document through complex linking schemes. Google’s PageRank and similar methods for determining the relative importance of Web documents have been subjected to manipulation.
The TrustRank method calls for selecting a small set of seed pages to be evaluated by an expert. Once the reputable seed pages are manually identified, a crawl extending outward from the seed set seeks out similarly reliable and trustworthy pages. TrustRank’s reliability diminishes as documents become further removed from the seed set.
The researchers who proposed the TrustRank methodology have continued to refine their work by evaluating related topics, such as measuring spam mass.
