When I look at a friend's About page on Facebook, under "email" I almost always see a link that says "Ask for 's email". Likewise for a lot of other fields on that page.
How do I set it up so that it works like that for my email address as well? When editing that information, I can see options to show it to all my friends or none of my friends and things like that, but I can't see an option to turn on this "ask for" feature.