First, get off facebook it's been the worst thing for any relationship in so many cases it's ridiculous. this bickering that goes on on facebook is a situation where you can't escape because it's always in your face. the sideways insults are common like your mother in law did and the going back and forth looking for support, encouragement and using it to insult others in the same stream is just so high school. it's not good for you, your husband or the other people that see all of this and tbh I feel even if you are ok with fb in general, at the moment it's really bad for your own mental health and well being. no I didn't mention the health of your marriage because frankly, and I'm sorry, i'm blunt, there seems to be very little hope for your addict husband. it's a kind of codependent cycle he's in. he stops and says enough to appease you for awhile just to get on your good side then he goes back to his vomit which is the drugs and alcohol. His mother is the enabler and he allows that. With you up against that kind of a formidable opponent, i'm not sure you'll break through to him. as it seems you've tried to hold him accountable but it is clearly not working.

My very straight forward solution would be to get out. But that's your decision to take what I've said or leave it. that's what I would do.