Randi Zuckerberg, the sister of Facebook's CEO, was caught up in an online-privacy spat after a photo she posted on Facebook that was intended to be private was shared on Twitter. Zuckerberg, who called the episode "way uncool," apparently had allowed photos to be shared with the friends of people tagged in the image, one of whom had assumed the picture was for public consumption. The incident raises questions about Facebook's approach to online privacy, and highlights the complexity of the network's approach, Mathew Ingram writes.

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