Social, Viral spread of X

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Something you can share with your friends.
Once it gets enough traction, it's shared with their friends.
As long as it continues to get traction, it lives on, builds up, becomes viral.

Like shared facebook posts, but targeted on a specific X, worthy of getting it's own social app.

What is X? a Holy Grail. I'll be glad to team up with whoever comes up with it (and do the wiring).
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Additional Info

  • Time commitment: part time (10h/week)
  • Idea stage: just an idea