This will prevent Sam 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.
“Youth must be the worst time in anybody's life. Everything's happening for the first time, which means that sorrow, then, lasts forever. Later, you can see that there was something very beautiful in it. That's because you ain't got to go through it no more.”
―
James Baldwin