I encourage everyone here to upvote this idea
Approval Process for Social Media Posts (with Notifications)
It is “Being Reviewed” but has seemed to have stalled and could use more community attention.
I created this idea after the first idea was prematurely marked as “Deliver” by HubSpot when they launched their "Draft only" social publishing permission to manage who can create draft social posts and publish social posts, as @Jnix284 listed in her comment. The feature delivered was definitely not an approval feature with notifications or commenting, but HubSpot considered the matter resolved… so the new Idea was opened.