In addition to your institution sharing stories about your students' successes, other schools and organizations may also publish stories about their achievements. This typically happens when a student has attended multiple colleges/universities or an honor society or greek organization publishes a Merit achievement about them.
You can automatically repost these stories to your own institutional Merit page. To do this, visit the General section under the Settings tab and scroll down to the Timeline block. Then check the Automatically share all of my students' achievements box:
The shared achievements will appear on your institution's public Merit page as pictured below: