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One consequence not foreseen by the builders of the system was that with the almost immediate reporting of newsworthy events, tens of thousands of people worldwide — along with criminals — would teleport to the scene of anything interesting, thus creating disorder and confusion. The plot centers around a television journalist who, after being fired for his inadvertent role in inciting a post-robbery riot in Los Angeles, seeks to independently investigate the teleportation system for the flaws in its design allowing for such spontaneous riots to occur. His investigation takes him to destinations and people around the world within the matter of less than 12 hours before he gets his chance to plead his case on television, and he encounters the wide-ranging effects of displacements upon aspects of human behavior such as settlement, crime, natural resources, agriculture, waste management and tourism.
- Barry Jerome "Jerryberry" Jansen - "newstaper" (television correspondent and cameraman) for Central Broadcasting Association (CBA). Father Eric brought the family to ruin when attempting to participate in the massive investment rush for the then-burgeoning stock in displacement booths.
- George Lincoln Bailey - CBA editor
- Wash Evans - host for CBA's Tonight Show flagship news program
- Janice Wolfe - friend of Jerryberry
- Nils Kjerulf - manager of Los Angeles International, now far from the major depot of mass transit of yesteryear due to the decrease in need for air transport
- Gregory Scheffer - customs guard.
- Dr. Robin "Robbie" Whyte - inventor of the displacement booth
- Harry McCord - former Los Angeles Police Department Chief.
- Tahitian ticket-taker - formerly owned a house until squatters drove him and his family out and moved in
Other Flash Crowd stories by Larry Niven
- The Alibi Machine
- All the Bridges Rusting
- A Kind of Murder
- The Last Days of the Permanent Floating Riot Club
Use in other works
In various other books, for example Ringworld, Niven suggests that easy transportation might be disruptive to traditional behavior and open the way for new forms of parties, spontaneous congregations, or shopping trips around the world. The central character in Ringworld, celebrating his birthday, teleports across time-zones to "lengthen" his birthday multiple times (particularly notable since the first edition had the error of the character heading the wrong direction, increasing that edition's value).
Niven's essay "Exercise in Speculation: The Theory and Practice of Teleportation" was published in the collection All the Myriad Ways In it he discusses the ideas that underlie his teleportation stories.
- "Flash Crowd" is included in the short story collection The Flight of the Horse. The story (or parts of it) was originally published as "Flash Crowd" in Three Trips in Time and Space, by Robert Silverberg, ed.
- "The Last Days of the Permanent Floating Riot Club" is included in the short story collection A Hole in Space
- Other stories in this series are in these two books and in All the Myriad Ways.
On the World Wide Web, a similar phenomenon can occur, when a web site catches the attention of a large number of people, and gets an unexpected and overloading surge of traffic. This usage was first coined by John Pettitt of Beyond.com in 1996. Multiple other terms for the phenomenon exist, often coming from the name of a particular prominent, high-traffic site whose normal base of viewers can constitute a flash crowd when directed to a less famous website. Notorious examples include the "Slashdot effect", the "Instalanche" (when a smaller site gets links by the popular blog Instapundit), or a website being "Farked" or Drudged (where the target site is crashed due to the large number of hits in a short time).
- Prucher, Jeff (2007-05-07). Brave New Words: The Oxford Dictionary of Science Fiction. Oxford University Press. pp. 65–. ISBN 9780199885527. Retrieved 19 July 2016.
- Grossman, Lev (June 13, 2012). "Lord of the Ringworld: In Praise of Larry Niven". Time. Retrieved 19 July 2016.
- Wasik, Bill (2009-06-11). And Then There's This: How Stories Live and Die in Viral Culture. Penguin Publishing Group. pp. 21–. ISBN 9781101057704. Retrieved 19 July 2016.
- Niven, Larry, All the Myriad Ways, New York: Ballantine Books, 1971.
- Buyya, Rajkumar; Pathan, Mukaddim; Vakali, Athena (2008-07-26). Content Delivery Networks. Springer Science & Business Media. pp. 274–. ISBN 9783540778875. Retrieved 19 July 2016.