Facebook Open Graph Images
To set a specific image to display when sharing a link on Facebook use the Featured Image option at the bottom of the right column. Please use an image that’s at least 200×200 and preferably 1500×1500. (Maximum image size is 5MB.)
The Featured Image is only used on Facebook and will not be displayed on the page. However, when using the Featured Image option on an Event in the Calendar, the image will be displayed on the page and in Facebook.
If you choose not to select a Featured Image, Facebook will automatically pick from the images on the page along with the Celebrate Frederick logo.
If the Featured Image that you picked is not showing up on Facebook, the setting may be cached. Go to the link below, type in the URL for the page you are sharing and click “Debug”. This will clear Facebook’s cache for the page.
Now return to Facebook, refresh your page and try sharing the link again.