Penguin Update: Choking on link spam

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Ranking algorithm update to combat low-quality links and unnatural link building
A page with good content will automatically be linked to by others. One of the most important ranking factors is based on this simple idea: (natural) backlinks .

Over time, many webmasters and SEOs began to singapore cell phone number list engage in frequent link exchanges (unnatural backlinks) and thus manipulate their rankings.
In many cases, however, this came at the expense of quality. Often, the link targets offered no significant added value to users. Google's challenge to low quality began with Panda, but entered a second round with Penguin in April 2012 .

What are the reasons for unnatural link building and therefore against the guidelines?
Links with a very hard anchor text (e.g. “vacation”)
Links from the footer (side-wide and in the non-visible area)

Backlinks that have been created unnaturally (e.g. commercial)
Unnaturally fast backlink development (period)
Links from link lists, article directories and web catalogs
Links from thematically irrelevant websites (unnaturalness)