On Thursday, the Buffalo federal court judge overseeing Paul Ceglia’s claim to own half of Facebook — by virtue of a 2003 contract he claims CEO Mark Zuckerberg signed as a Harvard undergraduate — is expected to enter an order directing Ceglia to return from Ireland to produce crucial undisclosed computer evidence, and to answer Facebook’s withering questions about the authenticity of the contract and his own failures to comply with previous court directives.