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Facebook has a limit of 5000 friends. There are many ones there having 5000 full of friends.
go to find friends or search your friends that have a facebook
No only your firends can see them. If you are talking about people of Facebook which you are no friends with then no.
Your friends that do not have facebook can not see your profile or posts.
Yes. Get a Facebook account and add Facebook friends there, You can have both a Myspace and a Facebook account.
There is a limit of 5000 friends on a personal Facebook page.