CommentThis! is a free Chrome add-on developed by CommentThis! that allows users to comment and chat on any webpage. With this tool, users can leave comments on YouTube videos that do not have commenting enabled, chat about news stories on pages without comment forms, and leave feedback on products for other users.

One of the main features of CommentThis! is the ability to comment on YouTube videos that do not allow commenting. This is particularly useful for users who want to engage in discussions or share their thoughts on videos that would otherwise not have a comment section.

Additionally, CommentThis! allows users to chat about news stories on pages that do not have comment forms. This feature enables users to have conversations and exchange opinions with other users directly on the webpage, enhancing the interactive experience.

Furthermore, CommentThis! enables users to leave feedback on products for other users. This feature can be helpful for providing recommendations, suggestions, or sharing experiences with other users who may be interested in the same product.

Overall, CommentThis! is a versatile add-on for Chrome that enhances the user's ability to engage and interact on various webpages, even when commenting or chatting options are not readily available.