You can hire an attorney to deal with those making the posts.

Having your children around a registered sex offender could be grounds for a change of custody.

Unlikely, but a lawyer would need to review all the documentation. You don't indicate what you believe they did wrong. Did they leave the facility...

It is up to his parents who he dates. But a 19 year old wanting to date a child should really seek mental health treatment. Stay away from kids.

You can hire an attorney in an attempt to quash the subpoena.

Every day in every courtroom victims of domestic abuse try to recant their stories, usually because the abuser has apologized and promised not to...

You can speak to your PD about withdrawing your plea, but unlikely.

You can sue anyone, but doesn't seem like much of a case.

Lawsuit will cost you thousands, and you appear to have nothing to sue for. It is their forum. They can say who can use it.

Almost hurt means almost had a case. If injured, see a doctor and then retain local counsel.