Cohn said visitors to federal Web sites should be able to view official information without fear of being tracked either by the government or by third parties such as YouTube, which is owned by Google Inc. That expectation is consistent with the government's own stance on the use of cookies, she noted, pointing to a memorandum issued in June 2000 by the White House Office of Management and Budget.

That memo discussed the "particular privacy concerns" raised by the use of tracking cookies on government Web sites and concluded that cookies shouldn't be used on such sites "because of the unique laws and traditions about government access to citizens' personal information."

"The concern is that our access to government information shouldn't be part of the data that Google gets just because the government decided to use a technology from YouTube," Cohn said in an interview today. She added that the issue has become even more important now because a growing number of government agencies and legislators have begun to embed YouTube videos on their sites, perhaps without realizing the potential privacy implications.

"Your browsing through government information shouldn't be a data collection opportunity for private companies," Cohn said. "You don't want to be looking for tax information on a government Web site and then have Gmail pitching tax software. That's creepy."

Cohn's letter reminded Craig of Obama's promise to run a transparent government and called on the White House to release information on the reasoning behind its decision to issue the cookie waiver. She also asked the Obama administration to work with YouTube to try to end the retention of cookie data collected from any video file embedded on a government Web site.

In addition, Cohn asked the White House to add a link to the WhiteHouse.gov privacy policy near each video, along with specific information about the third parties that might be collecting data, and to look at the idea of streaming the videos directly from its own servers instead of letting YouTube host them.

Jeffrey Chester , executive director of the Washington-based Center for Digital Democracy, also said that the decision to allow the use of persistent cookies in embedded videos is worrisome.

Tools such as YouTube's Insight software could be used to do in-depth analysis of the data collected from WhiteHouse.gov visitors, Chester said. And it isn't just third parties that could potentially use the tracking data, according to Chester.

Such information could "give the Obama White House a tremendous amount of insight into public behaviors," he said. "Do we really want the government to sanction the use of a consumer profiling application that links our commercial behaviors with our civic behavior?"