This will prevent John 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.
“A lady came up to me one day and said 'Sir! You are drunk', to which I replied 'I am drunk today madam, and tomorrow I shall be sober but you will still be ugly.”
―
Winston Churchill
“In the course of my life, I have often had to eat my words, and I must confess that I have always found it a wholesome diet.”
―
Winston Spencer-Churchill