This is something new Facebook is doing, from what I understand. It was done under the banner of “fighting fake news shares” from what I gather, but of course it mostly punishes regular bloggers, who after spending a day or two writing something can’t even share it to their Facebook page. I wonder how this is going to make them feel about using the platform?
What changed: When you put a link in the comment box, it will generate an image, title and text, but you can no longer modify the title, content, or image. You can upload new images, but you can’t select the uploaded image (even if you upload the image you want, you can’t use anything other than the image they originally found for you).
Anyway, someone should develop a plugin that lets you decide what image Facebook is able to access when it scrapes.