CNET says:

President Obama has picked Nicole Wong, Twitter's legal director, to be the White House's first chief privacy officer, CNET has learned.

Wong previously was a vice president and deputy general counsel at Google at its Mountain View, Calif., headquarters, where she managed a team of lawyers that worked with the company's engineers to review products before they launched. The reviews included privacy, copyright, and removal requests, which earned her a nickname of "The Decider" — as recounted in a 2008 New York Times Magazine article.

This seems like good news to me; the fact that Wong worked at Twitter, which is the most privacy-friendly of the social networks, seems like a sign that she'll take our privacy seriously. If Obama chose someone from, say, Facebook, that would be a real cause for concern.