A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
Hi Doug,
Since March 9, 2015, Microsoft has no longer offered the SharePoint Online Public Website feature to new customers. New customers who subscribe to Office 365 after the changeover date won’t have access to this feature. Instead, they’ll have the option to subscribe to third-party solutions by using links from Office 365.
Here is an article for your reference: Information about changes to the SharePoint Online Public Website feature in Office 365.
And Post in blog is stored as list item in SharePoint. The blog or the posts cannot be anonymously accessible.
Regards,
Tisky