Ideally, content audit could take many routes, but eventually depends upon how an organization plans it as per its previous experiences. A standard process of social media content audit is the following: https://www.brainpulse.com/articles/social-media-marketing/social-media-content-audit-checklist.php
The first step in your audit is to compile all of the social media metrics you can to evaluate your overall results. These metrics include:
Number of followers
Likes
Shares
Comments
Clicks
Video views
Number of followers
Post reach
Number of mentions