Is it uncouth to “out” a rapist?

I feel so upset, disgusted, sad, etc. I just found out that an ex-boyfriend of mine has been getting women drunk and then raping them. He recently reconnected with me via facebook (we hadn’t spoken since we dated when I was 19 and he was 22; I am now 23 and he is 27).

We had been messaging back and forth and it seemed to be going quite well. He apologized for being such an asshole to me when we were dating. He was my first sexual experience and we did it once and then I never heard from him again. I felt super used as you can imagine. He seemed really apologetic, asking me if I hated him and that if I did he would understand. Now I just feel dirty for even talking to him. Maybe he was just trying to gain my trust or something.

I’m so angry. I feel like writing on his facebook wall for all to see stating "____ _____ is a rapist!" I know this probably isn’t the right way to go about it, but I’m SO angry right now I don’t know what to do with myself. Apparently one of the girls he raped has gone to the police, but I’m worried nothing will happen to him. Does anyone have any advice/suggestions on what (if anything) I can do? I’m having a lot of trauma right now as well because I feel like I could have been in the position these women were in. He lives in the same city as me, again, and I feel uneasy.

Is there anything that I can do?