The private beta should be for people who you know personally, or at least can identify by real name, so that you don't get trolls. There's a fellow called "physicsnewbie" who I don't recognise, and wasn't at theoretical physics, and whose name doesn't seem to indicate much experience. But, still, physicsnewbie had a good logo idea.
I am not comfortable with anonymous users at this stage, we should know who everyone is in real life, because it is easy to sabotage new things using trolls.
Who are you, physics newbie? Are you a student? A physicist?