A social image can be displayed when your homepage is shared by first logging in then going to the “SEO” button in the side navigation of your Dashboard, scrolling down to “SEO Settings” section and clicking the “Social” tab look for “Social Image Settings” click the “Select Image” button and select an image from your media library, finally scroll to the bottom and click SAVE.

A Google search reveals 1080W x 566H pixels is the optimum size for the social image.

You should configure the title and description fields shown in the Social tab which will override the admin default page title.

Facebook, Sharing, Social Media