You have full control over which items appear in your Latest Activity feed on your Ning Network.
You can add a custom message from the Activity Feed Settings page, which can include links, by typing into the text box under the “Add Activity Message” heading and clicking “Add Message”, or further enhance your Activity Feed by setting the feature up to display only the Network Creator’s content, or focusing on featured members and / or administrators, in addition to content from the Network Creator. What’s more, you can even pull in content from other pages via RSS feed.