By default, custom link images can only be used with manually shared links on FB fan pages. In this tutorial we will explain you how to assign a custom Facebook share image on per post basis in your WordPress site. Generally what happens is whenever any post link is shared, Facebook tries to grab images from the linked webpage. Many a times it allows you select a thumbnail, sometimes it fails to grab images and fetches only link title and description. In-case of auto posting; FB randomly grabs an image. All these things happens only on websites not using proper open graph meta tags.
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