In a move that could land Sanford Wallace in jail if convicted, a federal judge on Friday referred a lawsuit Facebook filed against the "spam king" to the U.S. Attorney's office for possible criminal proceedings.A written ruling from Judge Jeremy Fogel in U.S. District in San Jose, Calif., is expected early next week, a court clerk said. The action came at a hearing on a Facebook motion that Wallace be found in criminal contempt for allegedly continuing to send spam on Facebook.