It makes no sense.

Sharing to a social network or via email is a ubiquitous action nowadays but designers have still not been able to reach a consensus on what symbol to use to represent it. Not only does each major platform use a different icon, but they've each witnessed changes over the years.

Pixelapse explores.

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http://feeds.boingboing.net/~r/boingboing/iBag/~3/1TMjFDDqKDo/why-isnt-there-one-single-un.html