Thanks for getting back to me @wil.metcalfe. It was just an idea about sign up and there to be discussed so appreciate your reply!
Fully understand the reasoning for not going the way of FB/Google sign up with what you said. I still think there should be some familiarity about the sign up process though and email address is what us casuals are used to when signing up for social media sites.
I guess what I'm getting at is removing the need for a casual user to know what a posting key, active key, memo key is etc and have those functions running in the background as they go about exploring this place.