I understand your feeling to "set the record straight" but I wouldn't post photos, and here's why... she'll find a way to fake them herself to make you look worse. Or she'll claim you deleted messages, or altered them. She'll stop sending stuff in message form and instead start calling more often.
Instead, I'd go to the police about a non-mol (is that possible in a non-romantic relationship?). She's obviously harassing you both and the police will be able to see your phones for themselves (without the need to doctor it).
I would have you and all your friends and family block her. I wouldn't add anyone new to your social media accounts and check the people who are on it. I'd check your privacy settings and amend if you need to (including blocking your friends list). I would tell your children to go ahead and get FB accounts if they'd like but I'd also make sure their security settings hide their friends names, and I'd alter their names in some way (like First and Middle name instead of using last name) in case she has other accounts and tries to look for them. I'd tell them not to have a cover photo or profile photo of their face or anyone else in the family.
All this I would do while organising the non-mol and taking her to court. It IS harassment and I understand how down trodden you feel by it all.
If you feel the need to post on FB I'd just post a comment along the lines of: The truth will always set you free. Only the people involved in a situation know the truth and the rest will only ever know what they're told. It's possible to believe your own lies well enough that you can't tell where your lies begin and end. All the proof in the world won't have someone see the truth if they don't want to.
Honestly, you can't convince people to not believe her. You can only protect yourself and your family from her lies the best you can. She may have some sort of mental health issue because 10 years is a LONG time to carry on like this. Doesn't help that her children want nothing to do with her... of course that's probably your fault as well right?!