What is the knock knock app?

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Tags

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  2. #college
  3. #called
  4. #allows
  5. #humin
  6. #instant
  7. #clever
  8. #aimed
  9. #launched
  10. #details
  11. #knock
  12. #tapping
  13. #management
  14. #offering
  15. #sharing
  16. #group
  17. #contacts
  18. #contact
  19. #phone
  20. #today
  21. #behind