Guest blog posting is a content marketing tactic used by bloggers and marketers for the purpose of gaining website traffic, reaching a new audience and improving search engine rankings by way of earning high-quality editorial backlinks.  Guest blogging can work in one of two ways: (1) A guest contributor writes a post to be published on your website's blog or (2) you , or someone on your behalf, writes a blog post to be published on a third party website's blog.