you mean a viral distribution system? it very much depends on the value the app provides.. http://www.secondshares.com/2010/06/09/metrics-that-matter-for-socia

you mean a viral distribution system? it very much depends on the value the app provides.. http://www.secondshares.com/2010/06/09/metrics-that-matter-for-social-gaming-investors/ http://www.secondshares.com/2010/06/09/metrics-that-matter-f... here is some information for you to understand this "referrals" thing better :)