Workers' compensation claims by employees injured at the workplace allow for compensation for lost wages and medical expenses while employees remain unable to work. Rachelle was injured at work and received workers' compensation, including wages while she was recovering. During recovery and while Rachelle is still listed as not able to work, Rachelle's sister posts pictures on social media of Rachelle waterskiing with the caption "had fun yesterday at the lake." Would this post be admissible as evidence in a civil trial? What authentication would the court likely require?