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Updated January 2019:
Thank you for coming into the community with your concerns. I agree wholeheartedly that being able to choose the right image is an important part of marketing through social media. Facebook has recently been making changes to how they are handling posts from third parties like us, as well as what images they will or won't use. As they make changes and we adapt, we'll continue sharing what information and tips we can.
I apologize for the dead link. Here is the link I believe he was sharing with the Community. I have also removed this link from his original post.
Please feel free to reach out if you need anything else.