On Facebook, and other social media sites, when you put a link in your status post or message, it generates a teaser summary with a thumbnail image.
My question is this:
Is there a way to tell the crawlers what images to use for thumbnail options?
The image you have posted shows an option where you have "Choose a thumbnail"? You keep clicking the "Next" arrow until the image you want pops up. It pulls all the images on the page so mostly you should not have a problem choosing the appropriate image.
But you can only choose from these options as far as I know. You also check No Thumbnail, if you choose not to have one. But I don't think you can add one that is primarily not on the page.
Better you can Uncheck the no thumbnail options.
You can use Facebook Open Graph metatags to specify your thumbnail:
<meta property="og:image" content="http://'image source goes here' >"/>
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