I've got a saga going on Facebook at the moment ...
A woman I knew at school recently left her husband. She says he was violent towards her, he's involved in petty crime, etc. She makes endless Facebook posts referring to him either directly or indirectly: posting a ton of those "I'm a strong independent woman who don't need no man" memes, posting a picture of a bin bag full of his stuff, etc. Meanwhile, a mutual Facebook friend is getting married this year and keeps posting about the wedding, the honeymoon, dress fittings, cakes, etc. She and the soon-to-be divorcee seemed to be tolerant of each other at first but somehow (maybe there were private messages between them, I don't know) this has turned into open hostility. They keep making nasty comments on each other's posts: "you're a bitter old witch, no wonder he left you", "I left HIM, it'll be your turn soon, enjoy your wedding plans, bet he's cheating on you already ..." And they still seem to have each other friended, I guess they just enjoy sniping at each other ...