EVERYTHING YOU WANTED TO KNOW ABOUT PRIVACY SETTINGS!
How do I change my privacy settings to limit who can write on my WB?
First, go to your white board and click "Privacy."

This will open a window with your current settings:

If you want to completely cut off contact with other players (this means not even your sisters can talk to you), select "None."
If you want to limit your contact to only those in your house, select "Only Sisters."
If you haven't had any issues with other people and you want your WB open, select "Anyone."
I blocked someone, but they are still attacking me! What's going on?
Blocking does nothing to prevent attacks. Attacking, slapping, and burn listing are a part of the game that cannot be avoided. All blocking does is prevent someone from being able to leave you messages. You should block someone any time they leave you an inappropriate message or make you feel uncomfortable, but remember that you cannot block them from using any functions of the game.
I accidentally blocked someone, how do I undo that?
As you can see in the picture above, opening your privacy settings also opens a list of everybody you've blocked. Simply click "unblock" under their name and they will be able to talk to you again.