Privacy icon on ads?

“With a lot of prodding from the Federal Trade Commission, the Internet advertising industry has committed to telling Web site users about how they collect and use data to customize the ads they display. And it has agreed to find a more prominent and clear way to do this than the cryptic privacy policies you can find if you click a tiny link at the bottom of many Web pages.”- Seeking a Symbol for ‘This Ad Knows About You’ - Bits Blog - NYTimes.com

Good idea but let’s think here. An agency runs ads on many, many sites some of which are individual, direct buys while others are network buys. In some cases ad networks collect data and target, in some they don’t. The agency typically collects data and may target as well. The icon should include privacy info from both - but how can this be managed? My gut feeling is that everyone will just slap the “we do everything” icon on the ads and the icon itself will lose its meaning. But this is still a step in the right direction.