What is Spammers ?
What is Spammers ?, Spammers are a machine / robot is programmed to spread the links of a site (usually in a promotional effort) in each textarea they meet. They (the machine) will scan each web page, and if found no column comments, they are programmed will be filled with a username, email, and of course the links would they promote. The existence of the links left by spammers in a blog will cause declining credibility in the eyes of the blog search engines like google. Hence it is an effort to anticipate that the spammers to stop its attacks, then by google known nofollow attribute (or can we read the relations = nofollow).
Relations between the nofollow, Google, and the credibility of a blog is very tight. Search engines like Google will be crawling (read = index) for each web page, and indexes each link meets. When webspider (index engine) to find the links that have been deemed “low rank”, it will lead to blogs that include links would decrease his credibility in the eyes of google. This was once again able to lower the pagerank, ONCE AGAIN, lower pagerank. What are the links that are considered “low rank” them? One is the links from the spammers, then warez, piracy, sites known to distribute viruses, broken links, sites that have been banned as google, etc. Therefore, be careful, lest we give links to warez sites or sites that are getting banned by google, and beware of broken links (links that are damaged or not valid).
Note: Do not assume your blog / site with a pagerank 0 (zero) as a “lesser sites.” “Low level” here is related to whether the site favored by search engines, while the site berpagerank 0 could be because the site is still new, so it is only given by google PR 0. Hopefully, this explanation does not cause misunderstandings.
so, use the plugin Askimet to avoid spammer
Akismet checks your comments against the Akismet web service to see if they look like spam or not. You need a WordPress.com API key to use it. You can review the spam it catches under “Comments.” To show off your Akismet stats just put
<?php akismet_counter(); ?>in your template. See also: WP Stats plugin.