Ah, that means you're....new. There are ranks to these titles. Here is a whole...well almost whole list of them here.
There's this title by my name that says "First Son." Does anyone know what that means at all? I've also seen other titles by other peoples names too like splicer.
your forum rank is a combination of your join date and your post count, unrelated to your gaming, except for special ranks given out.
First Son is a reference to the inFAMOUS game.
The ranks are like your "position" here. It shows people how long you have been here and how much you contribute to the community. The more you post and the longer you stay, the more you'll level up.