Plagiarizing content is an offense that could result in legal hurdles. Identical or paraphrased content can compromise the visibility and ranking of a site on search engines at best; at worst, such a site can be pulled down and blacklisted. MediaOne – Singapore’s best SEO consultancy advocates that all content posted on your site is 100% unique and relevant to the target audience. It says: try to use checking tools such as Copyscape to be absolutely sure. However there is no need to pass the uniqueness test completely. Google tolerates a certain amount of duplicate content because naturally, there are quotes, formulas, examples cited that cannot be unique.