When sharing the link to this website in Messages for iOS 10, a blank image was being displayed in link previews. This post said it’s an Open Graph image, so I started searching for information on that and WordPress. It turns out the Jetpack plugin takes care of this, and you can customize the image that displays or remove Jetpack’s Open Graph tags by adding code to
functions.php. I chose the latter method, which uses the following code:
add_filter( 'jetpack_enable_open_graph', '__return_false' );
Update: Jeremy Herve tweeted a patch which will be in the next Jetpack release. It fixed the blank image issue. And while I don’t like my big head being more than a favicon, it’s slightly better than a blank og:image.