Jack Vale knows what you did last summer, and last night and this morning -- as long as you shared the moments on Instagram.
Vale freaked out strangers by trolling the social media accounts of those nearby using publicly accessible geo-data. Vale could find and call out names and personal information, such as what they ate for dinner last night and their nicknames for loved ones.
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The encounters made the victims of the prank question whether Vale was a mind reader or just a stalker.
The takeaway is yours for the choosing: Be careful what kind of personal information you share on social media, or totally freak out the guy standing next to you on the elevator.
BONUS: 7 Pranks You Should Probably Never Play
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