Wolf, there's nothing wrong with being happy, you deserve that. And there's nothing wrong with posting about being happy on social media in general terms. But the specifics you posted did sound a bit like rubbing your W's nose in it. I know a couple that got into a "who's life is better" Facebook war that started out like this, the more they tried to convince everyone how great their lives were the less anyone believed it. It was not about their happiness, it was about revenge.
So by all means be happy. But try to avoid posting vindictive comments, or even comments that can be perceived by your W as vindictive. Hopefully you're not out for revenge, I would hope you are past that. But even if you are after revenge, living a great life is the best possible revenge you can get. Actions, not words.