In a decision Tuesday, U.S. Magistrate Judge Leslie G. Foschio in Buffalo, N.Y., ordered Paul Ceglia to pay the fees after ruling that he violated a pretrial discovery order and failed to turn over email account information.
The fee comes on top of an earlier $5,000 fine by the judge.
Last month, Foschio said Ceglia must reimburse Facebook for legal fees it incurred in trying to get him to comply with a court order in the partnership dispute. Ceglia protested against the "stratospheric" legal fees charged by Facebook's lawyers.
In a long-running dispute, Facebook and Zuckerberg have denounced Ceglia's claims that he and Zuckerberg signed a 2003 contract that gives him an ownership stake in Facebook. The Menlo Park, Calif., tech giant this month filed for its IPO.