From Slashdot:

"An article from the National Association of Colleges and Employers contains yet another horror story about a prospective hire's Facebook being checked — with a different twist. The interviewee had enabled privacy on his profile, '[b]ut, during the interview, something he was not prepared for happened. The interviewer began asking specific questions about the content on his Facebook.com listing and the situation became very awkward and uncomfortable. The son had thought only those he allowed to access his profile would be able to do so. But, the interviewer explained that as a state agency, recruiters accessed his Facebook account under the auspices of the Patriot Act.' How can a 'state agency' use the Patriot Act to subpoena a Facebook profile?"

What he said... how?

State Agency Uses Patriot Act to get Facebook info