In no particular order, these elements are most often seen in content that takes on a life of itself and spreads for you.

  1. Humor
  2. Sarcasm
  3. Satire
  4. Sex
  5. Controversy
  6. Organization
  7. Brevity
  8. Originality
  9. Immediate practicality
  10. Statistics

The more you effectively combine (without looking like you’re trying to hard), and better it typically works.