Tech Experts Respond to Latest Pew Internet Survey

The full report indicates that Pew supplemented its sample of high-tech experts via respondent referrals. This is quite risky, especially for an online survey where anonymity reigns. I would be interested in seeing the roster of experts by industry to substantiate the findings (especially this one: 66% predict at least one devastating attack on network information infrastructure or the country's power grid in the next 10 years.