Users who are in the test group will see a new checkbox (pictured above) titled "Hide From Your Timeline" that appears next to the existing News Feed post button that allows you to set the privacy settings of your post. So far, it doesn't look like the option is available on Facebook's iPhone app.
Again, only some Facebook users are part of the test, so it remains to be seen how the new feature will affect what your News Feed will look and feel like. But, as you can imagine, the new posts sound perfect for things you might otherwise be hesitant to share like gratuitous food photos, all 800 of your check-ins while on vacation, and even your latest hot take on the current election cycle. In a statement to The Verge, Facebook said the test comes in response to users interest in such a post type and to "make it even easier to control where your posts live."