Talk to your lawyer and let them know what's going on.
my son father is lying on social media about him and I. We have court hearing very soon. I never see anything like it he make up the whole story?
Make sure you have a good lawyer, don't worry about what he is saying on social media, all that matters is whatever you are having to deal with in court, that is where your focus should be.
Whatever you do, do not stoop to his level. Make sure you have the best lawyer you can afford. And make sure you surround yourself with people who are upstanding and trustworthy people.
All of the above and don't post anything on social media, it can and will be used against you in alimony, child custody, child support, visitation and divorce.
When folks start posting they start saying all kinds of stuff, true and false.
Print out everything he and everyone is saying about you and your family.
Hire an attorney.