This will prevent Izzy 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.
“Although we belong to a species which spends an alarming amount of its time blowing things up, every now and then we are moved to add gargoyles or garlands, stars or wreaths, to our buildings for no practical reason whatever.”
―
Alain de Botton