My IANAL interpretation is that you can't ever say that Facebook infringes on anyone's patent, and you can't ever say any of Facebook's patents are not valid. I

My IANAL interpretation is that you can't ever say that Facebook infringes on anyone's patent, and you can't ever say any of Facebook's patents are not valid. In any setting, not just in court or as part of a legal process. Careful what you write in AskPatents! You can defend yourself, however you can not do so by saying anything bad about Facebook, you are basically restricted to say you do not infringe. I'd say it qualifies as a legal trojan horse.