Privacy law was largely created in the pre-Internet age, and new rules are needed to keep up with the ways people communicate today. Much of what occurs online, like blog posting, is intended to be an open declaration to the world, and law enforcement is within its rights to read and act on what is written. Other kinds of communication, particularly in a closed network, may come with an expectation of privacy. If government agents are joining social networks under false pretenses to spy without a court order, for example, that might be crossing a line.
A national conversation about social networking and other forms of online privacy is long overdue. The first step toward having it is for the public to know more about what is currently being done. Making the federal government answer these reasonable Freedom of Information Act requests would be a good start.