Yes, dittany, I was thinking about that. Print the crap out, WANC, and give to your lawyer. But dispassionately-the more crap he dishes out will be the better for your circumstances with the divorce, won't it? But don't let it upset you-it is validity and clarity. And probably par for the course for divorce territory.
But don't let it upset you; people will think what they will. Your character is obviously more well grounded and good as demonstrated by your behavior than your h's. He may think he is getting the upper hand in smearing you, but I really think that will backfire on him ultimately.
Dittany, would it do any good for WANC to not say anything to h, but post rebuttal/denials to the lies on her FB page? Just a form statement-maybe suggesting that others check with her about the validity of anything posted about her. This may include a phrase that these slanderous/libelous statements will be pursued legally. And post it (the same form statement) as a timely response to anything he says on FB. WANC-ask your lawyer about this, especially if you have a job that deals with the public.
WNAC, I do still believe that the sooner the physical split of living arrangements is done the better it will be for your dc. I am not sure about the ages of your dc, but I think it might be ok to explain his outbursts as a simple compairson to the tantrums of a small child. "He can't have his way right now, so he is just having a meltdown. He'll get over it soon. Nothing to worry about." And it sounds like it isn't that far from the truth.
Re: h hanging around the single lady in front of you--good for you for the snicker...
it would be hard not to encourage the association with gusto...but I guess do nothing. Not getting upset-you win. So enough. But encouraging the other relationship for him would relieve you of his attentions for a while anyway-tempting.
I have not been through divorce, so my thoughts may be off the mark (sorry ). You have probably already done so, but if not, check out the other threads about it.