Quoting ScottS: I think the most important thing would be what would your H think about you acting on this information. Unfortunately, we see illegal things every day, and usually do nothing.
Thanks ScottS.
I think I see it as a few things.
First, I see illegal things every day. At our company we pretend to work often when we're sitting around playing games online. My wife surfs the web when I know she probably shouldn't. I speed on my way to work, and have stolen pens & such from the office supply cabinet.
The information she looked up was her ex-bf (an account she made for him). I understand that it's illegal, but since they know each other so well, I consider it something between the two of them. I told her how I felt about it, but I wouldn't think of reporting a friend for something like that.
Finally (and the most important to me), is that I've been working at not hiding things from my W. I'm doing my best to tell her everything that comes into my head, interesting, funny, hurtful, etc. Now as soon as she started threatening me (or warning me, whatever) that she was thinking about contacting the OW's workplace, I have a definate reason to filter any more information that I have. I certainly wouldn't mention anything else that could be used in blackmail later. Why? Because I can't trust my W to keep anything I give her confidential.
Sounds bad, but it hurts me to think that I can't tell my W something confidentially.