Excellent background to CBC exec's move to Twitter

The Globe and Mail's Simon Houpt writes:

In a sharp illustration of how the media landscape is shifting from traditional companies to new media powerhouses, Kirstine Stewart, one of the Canadian Broadcasting Corporation’s top executives, announced her surprise departure on Monday to head up the first domestic office of Twitter.
Ms. Stewart, the CBC’s executive vice-president of English-language services, will become the managing director of Twitter Canada, where she will focus on partnerships with media companies, other brands and advertisers.
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