This will prevent Yesuf from sending you messages, friend request or from viewing your profile. They will not be notified. Comments on discussion boards from them will be hidden by default.
“If you live with unhealthy people, to be healthy is dangerous. If you live with insane people, then to be sane is dangerous. If you live in a madhouse, even if you are not mad at least pretend that you are mad; otherwise those mad people will kill you.”
―
Osho