米Google が自然検索順位を操作するために不適切な外部リンクを発信しているウェブサイトに対して制裁を科した模様だ。先週末より複数のウェブマスターが通知を受け取ったと Googleのヘルプフォーラムに報告している。

Google has detected a pattern of links from your site to other sites that is either unnatural or irrelevant. This pattern attempts to artificially boost other sites' ranking in Google Search results. Such unnatural ranking would cause search results to show preference for results not relevant to ther user's actual query. It also violates Google Webmaster Guidelines. Therefore, we are discounting the trust in links on your site. This manual spam action has been applied to *****. To fix this, remove the unnatural links on your site and file a reconsideration request. After we determine that you have compiled with our guidelines, we will remove this manual action."[Warning from Google, April 10, 2016]