Depends on your audience. For a tech audience, maybe one of each is fine without confirmation. Technical users would be more careful. For a much less technica

Depends on your audience. For a tech audience, maybe one of each is fine without confirmation. Technical users would be more careful. For a much less technical audience (at least 50% of FB users) you can never be too careful. FB would probably ask the user 3 times each, but they'd be guaranteed that their users would then enter it once incorrectly, and may never be able to correctly submit the form. Seriously though, it does depend on the audience, imo.