I do the hiding-fandom-self-from-RL for sure, because in the circles my family keeps and where I work writing slash isn't exactly something you'd bring up in conversation. Actually, I don't even like to tell people I write online unless I know the person I'm talking to is 'in' with the fandom thing.

But yes, stalker activity. Biiiiiiiiiig reason for paranoia, especially when you visit countries and events you know will be attended by said stalkers.