Yes you can use Facebook photos as evidence in Court. There is a procedure for authenticating photos. You'll need to consult with an attorney in your area for that procedure.
The recommendations in this answer are not considered legal advice for the purposes of ethical evaluation, nor do the create a retention of counsel wherein an attorney-client relationship exists. These recommendations should never be relied upon without first consulting an attorney in your jurisdiction. I am not your attorney, unless we enter into a written agreement fulfilling the terms of that agreement. The comments posted herein are purely for educational purposes and public discourse only.