When it comes to defamation law, there are a few things that need to be considered before a blog can be held liable for defamation. The first is whether the blog posts were made with actual malice, which is when the blogger knew that what they were saying was false and intended to harm the reputation of the victim, and secondly, whether the statements made about the victim were actually defamatory in nature.
Generally speaking, a blog is not typically considered to be responsible for defamation unless it is proven that the blogger acted with actual malice or made defamatory statements about somebody that was actually defamatory. This means that it is typically difficult for a blog to be held liable for defamation unless it is shown that the blogger was directly involved in making the defamatory statements or was aware of them and chose to publish them anyway.
In most cases, a blog does not have to take any action in order to avoid being liable for defamation. In fact, if the blogger removes any defamatory posts within a reasonable time after being notified of the possible liability, then they will generally not be held responsible.
Furthermore, if the blogger takes reasonable steps to ensure that their posts are accurate and do not contain any false information, then they will generally not be held responsible either.
Overall, it is important to remember that a blog does not automatically become liable for defamation simply because it publishes comments or content about somebody else. Rather, it must be shown that either the blogger acted with actual malice or made defamatory statements about somebody that was actually defamatory in order for them to be liable.
In most cases, taking these steps will protect a blog from any legal responsibility.