Now an app called Twitch, developed by Michael Bernstein at Stanford University in California and his colleagues, replaces a phone's unlock screen with an interface for crowdsourcing. Instead of swiping to unlock the phone, people can complete tasks such as choosing the better of two stock photos or verifying if a "fact" on a Web site is true. Bernstein's team put Twitch on Google's Play app store and recruited 52 of the people who downloaded it.
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