This is a twofold question :

1. How can I customize message that jetpack posts on facebook when my post is published (select if title or excerpt are shown)? Sometimes it posts just article title with a link, and sometimes it posts excerpt from an article and a link below it.
2. How can I use ACF (custom fields) with Jetpack publicize? I would like to construct custom text message from custom fields to show on facebook when auto publishing.