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This would depend on what type of videos and audios are shared. If it is anything that was recorded without the consent of the other party or they do not have the consent of the other party to share it, then no. If it is pornographic in nature, no. If it is an invasion of privacy in any other form, no. If it is copyrighted materials such as motion pictures or song recordings, then no. It would be best to read up on sites disclaimers like YOU TUBE to see what then express to protect them from legal action.
If you have a wavier that must be agreed to stating that upon agreeing to it that they waive any liability on the hots behalf and they accept full responsibility for the legitimacy of the files, their legality, and their content. That you nor your business is libel for anything that is provided on the site and are not to be held responsible for the opinions expressed by users.