This will prevent Stefan 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.
“From this arises the following question: whether it is better to be loved than feared, or the reverse. The answer is that one would like to be both the one and the other, but because they are difficult to combine, it is far better to be loved than feared if you cannot be both.”
―
Machiavelli