answer:According to this Facebook page, there is no way to undo the report: Unfortunately, there is no way to retract a report after you have submitted it. Please be aware a Facebook administrator looks into each report thoroughly in order to decide the appropriate course of action. If no violation of our Statement of Rights and Responsibilities has occurred, then no warning will be sent. If a violation has occurred, then a warning or more severe actions are taken. No harm done, then. Someone will look at at it and realize it was an accident.