Acres of newsprint and myriad computer bytes have been devoted to the ignominious episode involving Burson-Marsteller and its abortive attempts on behalf of Facebook to seed discussion about privacy issues and Google's Social Circle feature.

The ethical aspects of this case, in which Burson didn't disclose the client it was working for, have been widely covered. In short, the PRSA and other industry ethical guidelines state you must disclose who you work for when carrying out such activities.

But the ...