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cyberdisinhibition

n. A temporary loss of inhibition while online. Also: cyber-disinhibition.

According to the study, their world is expanding and narrowing at the same time because of social media's hyperlocalization quotient. And "cyberdisinhibition" — being more willing to behave online in ways they wouldn't in person — has both emboldened users and led them to inappropriate behavior.
—"Americans redefining their lives online and offline with social media tools," RISMedia, November 23, 2009