Honestly, I've seen way worse from people on social media - regularly (not to mention from our very own republican presidential candidate...). I empathize with the stress it's causing you, but if I were you I'd just try to let it go and move on - you didn't try to hurt anyone (and if you feel you did, you could always just apologize - that can go a long way).

I once texted my professor very inappropriately when I was hypomanic, which was not only embarrassing but potentially damaging to his career. Lucky for me, neither one of us ever mentioned it again and just pretended it didn't happen. Usually people are more than willing to 'forget' for the sake of social ease