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'{:' is mainly used to express ':}', just backwards.
It is used by a lesser crowd than ':}', but still has the same effect.
'{:' is mainly used online while chatting.
MSN (etc.) conversation:

Guy: I must be a raindrop, because I'm falling for you.
Girl: Aww. :')
Guy: {:
by Allie:3 December 25, 2010
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