Can I be sued for creating a facebook confessions page, for defamation

I am Admin of a confessions page where I post various confessions by anonymous students of our college which we collect by means of google forms. Recently I posted a conf where we partially blocked the name of the accused person. The person now is contacting deans and threatnening us with defaming lawsuits and her being suicidal and stuff. The accusation was that she was fraternizing in library which is quite common place in our college. I have posted around 750 confessions for around 2 years and we get many threats but this is the maximum heat I have received. I am still anonymous but my friends have been identified and threatened severely. Please advice if you need more detail please ask for it. I have the screen shot of this relevant post and all the posts posted over two years stored. Thank you.