I voted no, Open means open a network like you are suggesting would be very limited on availability of files. Do you or anyone you know of have a few hundred thousand friends with virtually unlimited sources to files.
I would seriously question the legality of sharing with friends only, at least here in the US. Any copyright that I have ever read does not have a clause in it that says you can share this with your friends.
If it were true that there is a legal loophole then I just made a bunch of friends. Everybody I share with is my friend.
Here comes da judge

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A little common sense goes a long way

Later Grandpa