Eh, that is ridiculous.
It's public information, why wouldn't you be allowed to look it up.
Its not entirely public information. This is why we have privacy settings.
Its information you wish to share with a certain number of verified friends, not for the general public.
Also its made illegal as I imagine its a form of social discrimination, i.e just because i go free-fall parachuting, doesnt mean im more likely to die on my days off and thus a no hire.
Allowing discrimination on a much broader spectrum is not a good thing, and employers need to realize that.