• by Wendy Davis , Staff Writer @wendyndavis, May 16, 2012

Any attempts by marketers to connect people's activity on mobile devices with their activity on PCs raises some obvious privacy concerns. But that isn't stopping some advertisers from asking to do so, says Jeff Greenfield, COO of C3 Metrics.

"We always get clients who say, 'Can you match people's PCs to their phones," he says, adding sometimes the company has to "put on our legal hat" and decide whether use of a particular technology will result in legal woes.