Facebook scrapes your pages for images to go along with the post you share. When it finds an image on the page it will use that.
To specify which image exactly you have to use Open Graph tags in the head part of you html page. The og:image tag in particular:
<meta property="og:image"
content="http://graphics.myfavnews.com/images/logo-100x100.jpg" />
Here is a list of plugins that insert the Open Graph tags for you.
If you like to put the Open Graph-tag code in functions.php yourself, check this article.
Good luck!
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