I frankly never got a stalker, but I also purposefully limit my interactions with people, if someone sends me a /tell with a question or asking if they can ask a question, sure, but anything remotely personal, I will stand directly in front of them, hit /busy in their view, stand there for 10-15 seconds, then move away, the /busy will stay on for at least half an hour, or however long it takes me to remember to take it off.