We talked to one major social media site which said that they are building in an automatic deletion. If you want out of that site and you want to recover your privacy, your personal information, you can push a button and over whatever period of time—I don't think it's that simple—that information will be deleted and you'll recover your information. To whatever degree it hasn't been distributed, you get to pull back what information you may feel is creating vulnerability for you.
On November 20th, 2012. See this statement in context.