This will prevent Katya 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.
“What is stronger in us — passion or habit? Or are all the violent impulses, all the whirl of our desires and turbulent passions, only the consequence of our ardent age, and is it only through youth that they seem deep and shattering?”
―
Nikolai Gogol