hide the like identities on facebook

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i am pretty new to facebook. i have a personal account. Well if i like some sites then i

I wonder why i cannot see who else likes the site... / the page.

example: http://www.facebook.com/Evangelisch/likes

well why is this so!?

Do some pages hide the likes of them away!? Is this due some configurations doable!?

in other words - can someone adjust to hide the identities of those who liked his page!?

hope i wAS ABLE TO POINT OUT WHAT i want to know- if not - do not hesitate to ask

greetings