How hard is it to make a Facebook?

Scene: A conversation with my friend’s father, who knows I do Web design.
Father: I have a business idea. How hard is it to make a Facebook?
Me: Oh, very easy.
Friend: He doesn’t mean to make a Facebook profile. He means to 
remake all of Facebook.
Me: Oh. Very hard.
Father: Oh, OK.

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While I was working as a store Santa, a boy asked me for an electric train set. “If you get your train,” I told him, “your dad is going to want to play with it too. Is that all right?”
The boy became very quiet. So, moving the conversation along, 
I asked, “What else would you like Santa to bring you?”
He promptly replied, “Another train.”