OK folks, we have a few options to mass delete content and libraries within salesforce.com. This is a task Salesforce Admins face constantly when you use Salesforce CRM Content and Libraries. There are 2 options below. You can pick the easier one.
Content Documents or Files can be deleted using Data Loader.
Delete Libraries using Data Loader and the same general steps below but export and delete against the ContentWorkspace object instead or ContentDocument. Alternatively manually delete libraries via the user interface.
Note: Best practice is to perform a Data Export for backup prior to deleting records within your organization.
2. Select ‘Export’
3. Check Show all Salesforce objects” and select Content (ContentDocument) object
6. Return to Data Loader, and click Delete
7. Follow the prompts to select the CSV file you reviewed in step 5 and delete the Content For more information, see Inserting, Updating, or Deleting Data Using Data Loader.
Once the content is deleted, navigate to the Library in your org to delete it.