Some have said "deny, deny, deny". That may work for some, but when you post stupid crap like TGFBI did, denying may be much more difficult to do.
Thus...all the more reason "NOT" give ammunition to the SO to use. Why does she need to know your handle at all...she only has the information if you give it.
I think most of the SO's are just hurt and angry (and rightfully so) and have a need to know something...doesn't mean they need to know explicit information that will dig you deeper in the hole. And, I would say most wouldn't divorce (especially if there are kids.) All that ranting and raving at the moment...is just that...ranting and raving...I should know...been there done that!
Also, let me give you an incident that happened to me and how he (we) handled the situation. My hobbyist got caught due to all the text messages going back and forth...all hours of the day and some late at night...against my warnings...and she found the phone bill showing all the texts going to one phone number...mine! He became so complacent with his wife "not caring" that he would also call me at all hours of the night...and how do you explain that? He got caught...so, I get a voicemail left by his wife one day...asking me to call her...which I didn't, of course!
Then, he calls me from his office to tell me what happened, and that he told her that I was someone he found on one of those phone sex lines (uh, huh...but, kinda smart really) and that he would have phone sex with me...and email me once in awhile, but that he had never actually met me. So, I get another call from her with another message asking if his story was true...that if I had a heart that I would call her and simply tell her the truth.
I didn't call...but after careful consideration, I did send her a text message telling her YES, that was the truth and that I had never actually met her husband, and that I would NEVER contact him ever again...and apologized for any hurt she may be going through...and that was that. No extra drama...I guess she got the closure she needed.
So, you see...sometimes, you just have to be prepared...and think on your feet. Some situations don't necessarily have to get that ugly...but, if you hobby...you gotta have a plan, just in case!