As Juan said, usually a page may be punished in two ways:
1. Lowering her ranking, which results in a decrease in its position in the SERP
2. Page is not being indexed by Google
Rincon added that webmasters don’t have a direct impact, on what keywords the site falls in the search results. The decrease in position may involve a number of phrases, rather than one or a few „chosen”. The team responsible for penalties is simply monitoring network traffic and SERP widely understood spam. They also benefit from reports submitted by users – they receive about 35,000 reports of violation of search engine guidelines per month. After a thorough site analysis, they decide whether the website in fact should be punished.
Juan Felipe Rincon also referred to the issue of multiple appeals sent by the website owners. He said that in such cases, usually the person responsible for the site, do not understand why exactly the site has been punished and „automatically” link from the Google decision – which of course does not bring any result. Rincon said that you should always carefully examine the site and remove all irregularities that led to the imposition of a penalty. Only then you can count on its removal.
What sites usually get „under the microscope” ? From the information provided by Rincon it shows that up to 45% of all sanctioned websites is being compromised by hackers, who place on them their own content.