Google Algorithm Update
- Automatically generated content;
- Participating in link schemes;
- Doorway pages;
- Hidden text or links.
Less than a month ago Google announced that Penguin became a part of its core algorithm. It means that Penguin now works in real time. Thus google penalties for spammy links are much faster now. If you find your site under this penalty try to remove spammy or low-quality links from the web. In case you cannot remove all of them you need to disavow the remaining links. For more detailed info read Google guide on this.
Dramatic Change of Backlinks' Number
Negative SEO from Your Competitors
- Building spammy links to competitor's website
- Pointing links to competitor's website using irrelevant anchors.
- Removing competitor's high-quality backlinks
The web is flooded with the offers from people who are ready to conduct this work almost for nothing. Here is an example of such offer from fiverr and it's only $5.
Cases, lifehacks, researches and useful articles
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http://negativeseoexpert.com/ this site is also offering negative seo service. ( source: google search)