A warning for Facebook IPO investors from Germany

Thilo Weichert, data protection commissioner for the northern German state of Schleswig-Holstein, said shareholders should be aware that if European privacy authorities have their way, "Facebook's business model will implode."

Weichert was quoted by German daily Frankfurter Allgemeine Zeitung on Friday saying Facebook could be ordered to stop transferring user information to the United States.

Facebook's IPO prospectus warns investors that its business is subject to "complex and evolving U.S. and foreign laws and regulations regarding privacy, data protection, and other matters" that could harm its business.