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Many blogs and news sites offer visitors a commentary feature for each article and post, which allows users to participate in a conversation. These comment features usually also have a site field so that the specified name is linked to the comment author’s web page. These types of backlinks are called comment links. Also, comment links belong to a natural link-profile and since these are often nofollow, the amount plays hardly a role here.
In WordPress, for example, comments are enabled by default, but the links are nofollow in most WordPress themes to avoid excessive and uncontrolled sharing of the linkjuice. Also comment spam, which is often a problem with WordPress, should be brought under control by this default setting.
Commentary spam was a major problem in the search engine optimization, but some major innovations have largely remedied this problem: On the one hand, there are good and free anti-spam plug-ins that are extremely precise for all popular content management systems work. On the other hand, spam-spammed websites are now punished within a few weeks or months, so that comment spam without bots is hardly worthwhile.
Comments in themselves are very valuable in SEO, as user-generated content, i.e all kinds of content, which can be created or edited by the user, are regarded as a quality feature of a website; Comments should be encouraged. Anyone who as Webmaster or Blogger would like to make their comments appealing to their visitors can use PlugIns to set the comment links from a certain number of characters to dofollow – my personal recommendation!