My understanding is that Facebook is a message board where every user gets their own board, and that your homepage includes posts from your contact’s boards? I

My understanding is that Facebook is a message board where every user gets their own board, and that your homepage includes posts from your contact’s boards? If so, how do you “break up” Facebook? Follow the AT&T model and and divide it regionally? Or maybe 2? One for people with last names a-m, and a second for n-z?