The idea is to shift the usual Internet balance of power in which a small group of people do most of the sharing and most others just lurk.
"Hopefully people who don't share as much will feel comfortable in this app sharing," said Slingshot product manager Will Ruben.
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While someone can take a screenshot of a photo they receive, pictures and videos that are received are deleted after they are viewed and someone moves on to the next item.
Facebook is also hoping to use the new app to reach beyond those already using its service or Instagram, which it also owns. Slingshot, which will launch on iOS and Android, is designed to share with anyone in one's address book, not just those who use Facebook.