I have three FB accounts. One that is my personal account, one that I run a page on and one that is just for a few games. I have the logos installed with different background colors and names so I know which ones are which.
I don't want any of the friends on the accounts to be friends on any of the other accounts.
Oh OK I see, though this could all be eliminated if you could just switch between multiple accounts in one app seamlessly. Maybe something you want to mention to the devs.