User comments about the content of a web page are of great value. Google gives great importance to user experience, and therefore, to users' positive or negative comments. Google also perceives websites the content of which received many comments as more active communities, which may have an impact on the ranking of the websites in question. When a web page receives many comments, especially those containing the targeted keywords, it may rank higher in the query results. Visitor feedback is also very important for webmasters. Criticism or praise about the content can help to improve or correct the content. In addition, since comments and ratings will attract attention, they may also encourage users to spend more time on the website.