Everything About Users ( Growth & Retention )

We are Digital Marketing & Propriatory Growth Afficianado. We are very much focused how could we combine art and science to answer a simple Question

Question : Can User # 2 add value to User # 1 ? If Yes , Can we enginner the tools/feature to enable this ?

Currently we are busy crafting some amazing ideas, experiments & analysis to help create us understand the value of Network Effects for startups and established Companies