One of the Internet advantages as research tool is that we can have immediate access to a considerable amount of information with reference to a particular topic. Search engines, for example, are able to retrieve in a few seconds a list of websites ranked according to their relevance to that particular subject. But relevance is practically the only parameter considered by search engines (Brin and Page, n.d.). This means that selecting what information is useful and which not can be time-consuming and often non-productive without an attentive screening (Harris, 1997: 2).