I have a problem when sharing posts from my blog to facebook. This happened only in the last few days, while before everything was fine.
When sharing the post, facebook is not presenting the image in the post in the preview but the embedded youtube video. Moreover, it is not possible to change in the sharing preview the image you want to be on the link.
This never happened before. How can I set again the only image present in each post as the default image for the link on facebook?