You had the same fears and anxiety regarding your ex's last girlfriend. And what happened? He cheated on her and left her. He has done this to every single woman he has been with. He will continue to do this. Ex's girlfriend does not have the life you want. She is with a fair weather friend and is posting rhe pics of someone elses kids. When the mom specidically asked her not to. Thats pretty pathetic.
Did you spell out the reasons why you dont want your kids pictures on facebook? Or did you go through your ex, who might want to insight anger?
I never go on facebook. Is there a way you can publicly post on her page or on the tagged photos "pleqse stop posting my kids pics up on a public page. It makes me unconfortable". That might embarass her.
Is there any way you can contact facebook directly? I know it is illegal to take pictures of other kids without the parents permission. I think this is really valid and i do not want my sons pics out there either. Has your divorce agreement been finalized yet? This is def something to add.