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filter

jetpack_open_graph_image_default

Filter the default Open Graph Image tag, used when no Image can be found in a post.

Parameters

$str
string

Default Image URL.

Changelog

How to use this hook

See “How to use actions and filters to customize Jetpack”.

Notes

You can use that filter to define a custom fallback image that will be used in Jetpack’s Open Graph Meta tags when no image can be found in a post. 
function jeherve_default_image() {
    $fallback_img = 'http://YOUR_IMG_URL';
    return esc_url( $fallback_img );
}
add_filter( 'jetpack_open_graph_image_default', 'jeherve_default_image' );
Alternatively, you can also rely on the jetpack_images_get_images filter to define a fallback image that will be used in multiple areas of Jetpack (Open Graph Meta tags, Twitter Meta tags, Related Posts, and more).