Content Bank is a feature in Social Media that allows you to create templates and use them in Social posting.
Note that Content Bank is an add-on that must be installed or part of your plan:
Once you have Content Bank installed, you can access it in Social:
Click on Add new content, you will be able to add categories:
Click on Edit Tags to add tags:
Once you add new content, your Content Bank will look like this and you will be able to filter the templates based on categories and use them in your posts: