New Thumbnail function and Facebook

Yeah sure it’s possible…

Although i’d personally suggest using get_post_thumbnail_id to get the ID for the thumbnail, then use wp_get_attachment_url to get the URL..

Something like..

$myvar = wp_get_attachment_url( get_post_thumbnail_id() );

https://codex.www.ads-software.com/Function_Reference/wp_get_attachment_url

get_post_thumbnail_id doesn’t seem to have a codex page, so hence the lack of linkage for that one.. i was simply looking here ..
https://core.trac.www.ads-software.com/browser/trunk/wp-includes/post-thumbnail-template.php