This will prevent Gregory 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.
“We all have at least two sides. The world we live in is a world of opposites. And the trick is to reconcile those opposing things. I've always liked both sides. In order to appreciate one, you have to know the other. The more darkness you can gather up, the more light you can see too.”
―
David Lynch