Making a Memory public will allow the Memory to appear on your public profile for those who access your public profile to see. To make a Memory public, go to the Memory you would like to make public. In the Memory Options, click the slider next to 'Make Public?' to make the Memory switch between Private and Public. Slide it on to make the Memory public. The Memory is now shared on your public profile. You now have the option to close the dialog box or share the Memory to Facebook also.