Use shortcodes on a page/post to display/edit all posts from all multisite subsites.
Multisite Post Reader allows you to use a shortcode on a page/post to display all posts from all sites in a multisite system. This allows you (as the SuperAdmin) to monitor all posts on your multi-site system. Although meant for multisite systems by creating a page/post on the ‘master’ site, it will also work on standalone sites. You could use it to display all posts for visitors. It will even work in a widget (although you would want to use some of the optional parameters to limit the post count and post length).
If you are the SuperAdmin of the multisite, an ‘edit’ link will be shown on each post; shift-click to open in a new window/tab.
A “Read more” link is provided for all posts.
Each post has a clickable title, and also shows the date of the post.