Many page admins have been struggling with link posts lately, unable to upload an image to go along with the post. The image that goes along with the link post is just the default one that Facebook pulls from the website.
Facebook confirmed to Inside Facebook that it’s not a change in link posts, but a bug that the company is dealing with.
A Facebook spokesperson said it should be cured soon:
It was a bug; should be resolved in the next few hours.
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Source: Inside Facebook
Facebook battling bug affecting link posts