First, "Internet Privacy" is an oxymoron. The idea of keeping something which has been put on the internet a secret is a myth. Anything which cannot, under any circumstances, be shared with the world should NEVER be put on the internet in any fashion.
That being said, who do you know that would seek you out (leaving out the question of "how did they even know to look for you here?"), figure out what your screen name is, snoop through your old posts, and then *expose* you to the world? That person sounds like an evil nemesis who has serious mental health issues and I would consider them a danger to myself and my family. OR, it's shared childish drama between you and one of your friends (I don't know you, so I have no idea which it is).
That's some crazy shit, either way.
Me: male, 43, straight, non-hierarchical, independent