What Is the Default Site Update Service That WordPress Automatically Notifies When You Publish a New Post?

The default site update service that WordPress automatically notifies when you publish a new post is WordPress.com. If you publish your posts on a WordPress.com site, WordPress notifies the WordPress.com blog administration team, who then notifies the authors of the blog posts. WordPress.

com also notifies the users who commented on the blog posts.com site using the WordPress.com blog administration panel, you can also choose to have WordPress notify the authors and commenters of the post on your behalf.