We all know that Facebook preview includes an introduction about the post, with its featured image as well as caption you add. The Facebook crawler determines the image and the caption you add in the post. To do this, the crawler scrapes your HTML to select the image and caption. But sometimes, it may happen that the system crawler does not work properly. They grab the different headers for your Facebook post, or the Facebook crawler may not be able to do crawl the open graph correctly, so the information preview with title or image is not correct. Here are some of the reasons Facebook is not able to scrape open graph information correctly: