This is really unfortunate. I'm trying to share a landing page on my Facebook page and having the same issue. It keeps using my logo because it's at the top of the landing page (even though I did add another image to the page)...so all landing pages/sign up forms that I share on Facebook will look the same. It can create confusion with readers thinking it's all the same sign-up. Imaging if all blog posts had the same image. If I add a featured image to my post, then it gets rid of the preview and the reader has to actually click on the little blue link, which they rarely do. They click on the image, which won't take them anywhere. What a bummer.
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