I wouldn't call her a slut. I would call her a poor misguided girl. Agree very much with Toad's posts of 22.28 and 22.35.
I really can't get my head round those on here saying it's her body, it's up to her what she does, we shouldn't demonise her, she's grown up blah blah. Yes, she is a grown up (just) but I doubt you all would be quite so 'right on', liberated and accepting about it if it were your daughter.
It's no good saying it's none of my business. Too late. We live in a world of social media and we can't get away from what is shoved in our faces when online. As much as we might want to ignore, we can't. I don't give a flying fuck about what anyone does at the local dogging site for instance - good on them, that's fine, consenting adults etc. But this girl was encouraged by the bar to do this. She was young (18 or early twenties). She was pissed. And there is no doubt she must have self esteem issues whether she recognises that fact or not.
Let's not make this a feminist issue either. The men were just as bad as her. And how can we ignore the numbers of men involved? Impossible because there is a shock factor here.