Sorry you're going through this, it's hard enough to leave a high-conflict marriage. The divorce process can be that much more painful.
Would you be willing to reactivate your Facebook account and keep screen shots of what people are saying is there?
It sounds like you have a lawyer retained? It might be worth asking how your county and judge views social media in a divorce case, especially when there are kids involved. Every county seems to have a different take, and some judges seem more irked by this than others. How they respond depends on what state you're in, the laws there.
There's an active thread on this board about dating while divorcing. It might be helpful for your situation, too.
https://bpdfamily.com/message_board/index.php?topic=325101.msg12967429#msg12967429