1) New every time - I don't think there can ever by a free and repeatable way to do it because its so valuable that any method that gets discovered quickly gets

1) New every time - I don't think there can ever by a free and repeatable way to do it because its so valuable that any method that gets discovered quickly gets saturated or gated to extract a % of the value 2) Bootstrap - grow from a small X that generates value for individuals/small-groups and slowly mutate into a Y that delivers value primarily from the network as your user-base grows. 3) High cost blanket advertising or PR - get an inrush of like minded people at the same time. I can't actually think of a success story that achieved this, plenty of failures though. 4) Better than 3) is to use capital to buy users and user activity such that the value stays in the network e.g. paypal giving away free $$ to every sign-up that they then paid to a paypal merchant.