Nofollow makes the links in comments and messages really work

Comments and messages were originally a great way for webmasters to build community and readership. Unfortunately, comment and message features are often abused by spammers and other bad actors, many of whom use scripts or other software to generate and post spam comments.

Too many spam messages of this kind not only affect the appearance, but in most cases will also have a negative impact on the search engine ranking of your website! This has led many webmasters to prohibit the posting of URL hyperlinks in comments or messages, but this makes it impossible to reply to some content that really needs link guidance.

Now, we can use the "nofollow" tag. A few years ago, major search engines such as Google, Yahoo! and MSN introduced "nofollow", and this attribute has been widely adopted. Any links that use the rel="nofollow" attribute will not be used to calculate PageRank or determine the relevance of your page to a user query.

For example, if a spammer puts a link like this in your comment:

<a href="https://www.jb51.net/">This is a nice website! </a>It will be converted to:

<a href="https://www.jb51.net/" rel="nofollow">This is a nice website! </a>This new link will not be taken into account when calculating PageRank.

In this way, problems that occur when passing PageRank can be avoided. Although spam comments and messages cannot be avoided, meaningful directional links can still be published normally!

By default, many blogging sites (such as Blogger) automatically add this attribute to all posted comments.