This will prevent Sandy 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.
“The worst thing you can be is a liar. . . . Okay, fine, yes, the worst thing you can be is a Nazi, but then number two is liar. Nazi one, liar two.”
―
Justin Halpern (Sh*t My Dad Says)