"LINE PagePoker" is an online tool provided by the official LINE website. It allows users to manually update the cached thumbnail and other information for web links shared on the LINE app. It also allows users to preview how the link will appear on LINE and check if the website's code is correct, making it easier for website designers to make adjustments and increase the appeal of the link. Additionally, when a website changes its featured image, this tool can quickly clear the cached link, ensuring that images are displayed correctly and in real-time.