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Legal issues depend on where you live and who your contestants are. In the US, there is a difference between sweepstakes, which are games of chance, and contests, which are games of skill. Your p...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/41246 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/41246 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
**Legal issues depend on where you live and who your contestants are.** In the US, there is a difference between sweepstakes, which are games of chance, and contests, which are games of skill. Your proposal is for a contest. [Inc has written an excellent article](https://www.inc.com/jim-belosic/social-media-contests-and-the-law-how-to-keep-things-legal.html) outlining the various issues. For a prize as substantial as $10,000, I would hire a lawyer to go over and improve your contest rules. $500 can save you a world of pain later (including things like perhaps having to award a duplicate prize). **Have a central location to make announcements.** A website is the best because then you can print the full rules, where to get a copy of the question/book, etc. Use Twitter to point to the website every time you update it. And to send reminders, etc. You could also use Facebook but Twitter would be a more reliable choice as it's public and they don't restrict who posts go to like Facebook does. State in your rules that it is the contestants' responsibility to keep up with the website if there are changes.