@happybeing : Multi-level is mathematically brilliant but I personally think it is better to stay away from it from a branding point of view. There is a lot of stigma around that type of structure and we all know that most people make emotional decisionā¦not rational one.
Also, what happen is that the compensation structure ALWAYS change as the network gets bigger in this model. Direct-Referral is in some way better because it creates a level playing field between people who join at the beginning and people who come later. People are being rewarded as the direct contribution they bring to the network.(not indirectly through multiple level)
Also, I am sure we donāt want to attract the āopportunity marketā driven people. They are flaky and mostly there if they can make quick money. I donāt think itās a good strategy. You are welcome to open the debate in a different tread. I will gladly represent my case in it. 
There is still a multiplier effect in direct-referral but no leverage compensation.
I would like to stay on the topic:
1- How can we incentivize people for getting the word out while keeping MaidSafe values intact?
2- Would it be better as an app or built-in mechanism in the core?
@Warren: I understand that you really care about this project and I commend you for that.
Word of mouth will happen even without having people being compensated for getting the word out. MaidSafe is that awesome! I think what we are looking for here is a way to āturbo chargeā by creating an extra incentive just like MaidSafe does for developers and farmers.
I like the idea of gamifying the process. People love games and it is a very powerful tool.(donāt get me wrong, I HATE the invites about Candy Crush on Facebook) 
What I understood of the platform is that it is decentralized and anonymous. 2 things that are very dear to me.
So to recap:
Problem #1: We must avoid people earning safecoin by bringing bots accounts into the network
Proposed Solution 1: Getting people to earn safecoin in proportion to the contribution of the new userās farming.
Proposed Solution 2: The promoter only earn safecoin if the person who join also decided to be a promoter himself by accepting the initial pledge. Making all of this voluntary on the part of the new user. If someone doesnāt want to earn safecoin by promotion, why should he sacrifice his farming earnings?
NOTE: Solution #2 may incentivize people to promote MaidSafe as an affiliate program since it is the only way they would be rewarded without much thoughts about real genuine users.
Do you have a better solution @Warren ?
Problem #2: How do we define the right %?
Proposed Solution 1: Let the first promoter choose an initial pledged % and let it carry out from promoters to promoters down the line. Let the bid system find the right one.
NOTE : Without upward pressure, the bid system will eventually bring it close to 0%. People will jump ship, especially if they are farmers.
Proposed Solution 2: Let every promoter set their own pledge(%). Maybe by setting a minimum space contribution(nominal)
Did I miss a points?