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A post on a social network, usually an image on Facebook, that insists upon being shared or otherwise posted to your main page. The text or image in question usually challenges to share the post so that it can spread like a virus all over a friend group.
"Most people won't have the guts to share this post!" (Image of an abused baby animal)

"Motherfucker don't share dare me!"
by MegGypsyRose March 26, 2014
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