9781422287231 Twitter®: How Jack Dorsey Changed the Way We Communicate

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ABOUT THE AUTHOR Celicia Scott lives in upstate New York. She worked in teaching before starting a second career as a writer.

PICTURE CREDITS 6: David Shankbone 8: Jack Dorsey 16: FEMA, Jason Pack

52: MasterLu - Fotolia.com 56: Joi

20: Jack Dorsey 22: White House 24: Evan Williams 26: Joi 32: Andrew Mager 34: Square, Inc. 36: Square, Inc. 42: Square, Inc. 44: Square, Inc. 46: Walt Disney 48: Square, Inc.

9: Pressureua 10: Lucian Milasan 12: Rudi1976 14: Steven Jones 37: Ekaterina Bykova 38: Syda Productions 40: Robwilson39 50: Cpenler 51: Viorel Dudau 54: Laurence Agron