Facebook Open Graph metadata and Twitter Card meta tags control which image appears when your content is shared on Facebook, LinkedIn, and Twitter.
The Facebook Homepage Image appears when your homepage is shared on Facebook or Twitter. The Facebook Default Image appears when a shared post or page doesn't contain an image.
Selecting an image
You should select an image at least 1200 x 630 pixels or larger. The smallest allowed size is 200 x 200 pixels.
Upload an image
- Click Site Settings > SEO.
- Under Facebook Homepage Image or Facebook Default Image, click Upload Image.
- Select an image from your hard drive or Media Library.
- Click Set Image. A preview of the selected image will appear above the Upload Image button.
- Click Submit.