There is an article (very long) in today's Irish Indo' about two USD Senators raising this topic, asking if anyone trying it was offending against the US Constitution. Tweek's post above above is right., the article includes this statement from Facebook about soliciting or sharing a facebook password: Erin Egan, Facebook's chief privacy officer, policy, responded last week, saying: "In recent months, we’ve seen a distressing increase in reports of employers or others seeking to gain inappropriate access to people’s Facebook profiles or private information. This practice undermines the privacy expectations and the security of both the user and the user’s friends. It also potentially exposes the employer who seeks this access to unanticipated legal liability
"The most alarming of these practices is the reported incidences of employers asking prospective or actual employees to reveal their passwords. If you are a Facebook user, you should never have to share your password, let anyone access your account, or do anything that might jeopardize the security of your account or violate the privacy of your friends. We have worked really hard at Facebook to give you the tools to control who sees your information...That’s why we’ve made it a violation of Facebook’s Statement of Rights and Responsibilities to share or solicit a Facebook password."