A word about images
To save on effort we are pulling images in if they are set via the appropriate Open Graph tag on the url of your content.
The markup for this looks like this:
<meta property="og:image" content="url-to-your-image-path">
og:image tag isn't set then, at present, a generic fallback image (related to the content type) will appear for that submission.
Platforms such as Vimeo and YouTube set this tag automatically using the video's thumbnail as the image.
Your CMS should give you the ability to specify an image for this purpose.