I want to make a single photo public on facebook.

ISSUE:

You are a good Facebook user and you have your photo albums not shared out to the public. Good job. Now you share some of them but not EVERYONE can see them. Maybe just friends or friends of friends.

The Solution:

1. Click your "Photos" on Facebook, OR, click the photo you want to share if it's in front of you already, then go to Step 4 if you just opened the picture.
2. Go to "Your Photos"
3. Find the picture to share to the public
4. Now click the "Edit" link.
5. Now click the link beside "Done Editing" .
Then choose what viewing access you want to give.
6. Click done Editing.

Now the share access has been changed.