Against the background of the search engines development, people who always broke rules and tended to see their site appearing on the first page by any means also developed more quickly. If three - four years ago any methods of spam search have been above Google's bend, many of them are relegated to obscurity now, giving the place to more refine and expensive ways in realization. The identification of spam in Google is completely automated today, moderators do not interfere with work of algorithms and don't delete a site by hand; it is done algorithmically.
The link is in some sense “a voice for”, specifying that the author of the document considers a site, which he refers to, observable. We can say without exaggeration that this idea has made revolution in the sphere of search technologies and since then the influence of external links increases only, and as to the majority of the experts, this tendency will remain in the foreseeable future.
