The centerpiece of the ad industry's self-regulatory privacy program are the "you-are-being-targeted" icons -- small symbols consisting of a lower case i inside a triangle on its side, which typically say "AdChoices" and appear in the top corner of behaviorally targeted ads. Consumers who click on the icons are taken to a page where they can learn more about online behavioral advertising -- or how companies mine users' Web-surfing history in order to serve them ads -- and opt out of that form of advertising. But a pair of studies released today by researchers from Carnegie Mellon University cast doubt …