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Joel Ewanick, the agent of change brought in by General Motors just over two years ago to shake up its moribund marketing operations, has unexpectedly resigned... One source indicated that it was only decided hours before a press release finally went out that Ewanick’s departure would be described as a “voluntary” resignation. That, said several observers, raises questions about whether there was more behind the departure than simply a disagreement over policy.

Stung by claims in recent weeks that its advertising doesn’t work, Facebook is pouring on the public relations to insist that in fact, ads work just fine on the site. But while some of the claims of critics rest on shaky evidence, many questions about Facebook’s value as an advertising medium remain among the brands that constitute the bulk of all advertising online and off.