zff = you + your #1 bff
messaging app just for you and your #1 bff
Me
how ZFF works?
4:06 PM
ZFF
you add your #1 bff.
4:07 PM
ZFF
your #1 bff adds you back.
4:07 PM
ZFF
neither of you can add anyone else.
4:08 PM
ZFF
if you change your #1, chats are gone.
if you stop chatting, your #1 friend is removed.
4:09 PM
My 
Snapchat, 
Instagram is a list of friends of friends of friends of friends of friends of friends of friends of friends of friends of friends of friends of friends of friends of friend
who I can't even un-friend
no more of that.