Jim Brock

Can you have industry self-regulation if one of the biggest players isn't following the guidelines? That's the challenge for online advertising in the face of mounting privacy concerns, and the source is one of the Web's biggest ad sellers: Facebook. The social media giant is running behaviorally targeted ads on its site that don't include the little triangular icons that are the public face of the industry's push to be more transparent about targeting.

The makers of the popular Firefox Web browser are exploring ways to create a do-not-track mechanism that could offer Internet users a way to avoid being monitored online.

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