PART 2...

Who said what? 21. Elon Musk; 22. Stuart Butterfield, boss of Slack; 23. Julian Assange; 24. David Cameron; 25. Tim Cook, boss of Apple; 26. Mark Zuckerberg; 27. Kim Dotcom; 28. Sheryl Sandberg; 29. Martha Lane Fox; 30. Jonathan Ive

Question time: 31. Uber; 32. Satyna Nadella of Microsoft; 33. Tinder; 34. Michael Fassbinder; 35. Newsweek; 36. Tom Hanks; 37. Virgin; 38. Dropbox; 39. Turkey; 40. Taylor Swift; 41. Spain; 42. Andrew Wylie; 43. Joan Rivers; 44. Allibaba; 45. Minecraft; 46. PewDiePie; 47. France; 48. Airbnb; 49. Selfies; 50. Vladimir Putin.

PART 3...

In pictures: 51. Bradley Cooper; 52. Talking Angela; 53. Shingy; 54. Manuel Noriega; 55. Google Cardboard; 56. The Queen sends her first tweet; 57. Destiny; 58. Charlotte Bronte; 59. Zoella; 60. No one.