Liker is a plugin for collecting ratings of WordPress posts and pages. The plugin allows you to quickly and accurately gather information about the usefulness of your articles. The plugin can collect ratings in both like and opinion formats. You can choose one of: like / dislike, yes / maybe / no, and a simple +1 button. This flexibility of settings allows you to use the plugin for various subjects and in multiple use cases. Many popular sites use similar solutions. For example, Google uses this to evaluate the effectiveness of its reference materials. Liker has very flexible settings that do not require knowledge of the code. You can change the color of the text and the background of the buttons, change their number and position, add a description through the WordPress editor, and enable/disable the plugin only on some pages.