This is a question for people who have received this kind of message in their Webmaster tools: Unnatural inbound links violate Google Webmaster Guidelines How long did it took for you to feel the results of this manual action? In other words how long did it took to lose your rankings & traffic from google after getting this message? Was your website removed from search engine completely or just decreased in rankings? Here is the message from google: Google has detected a pattern of links from other sites to your site that is either unnatural or irrelevant. This pattern attempts to artificially boost your site's ranking in search results. Such unnatural ranking would cause search results to show preference for results not relevant to the user's actual query. It also violates Google Webmaster Guidelines. Therefore, when determining your site's ranking, we will demote links to your site as a factor in our calculations. This manual spam action has been applied to example.com. To fix this, remove a majority of unnatural links and file a reconsideration request. After we determine that you have complied with our guidelines, we will remove this manual action.