This will prevent Tim 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.
“I love lists. Always have. when I was 14, I wrote down every dirty word I knew on file cards and placed them in alphabetical order. I have a thing about about collections, and a list is a collection with purchase. (Wired Magazine, "Step One: Make a List", October 2012)”
―
Adam Savage