accidentaly clicked ban on someones post. not even sure what that does. maybe there should be a "are you sure?" after you click "ban" or "don't." sorry {Birdbrain}, misclicked, didn't mean to ban your botg post.
I think ban means it just will not show their posts. It's not a report button.
any way to undo?
Hitting "ban" on someone's post alone shouldn't do anything. It should lead you to their profile, where you can hide the "hide" option to officially block their posts from your feed. You can see, and undo, any current bans from your profile. There's an option at the bottom of your page (after hitting the head icon to lead you to your profile page) simply shown as "Bans."