Anyone with notepad can make an IM record. Since it is saved locally, no one can disproved it. If I have knowledge of your IM handle, I can produce a salacious IM recording between you and I and all you can do is say, it wasn't so.
"I can produce a salacious IM recording between you and I"
Please don't, I have enough skeletons in my closet that I couldn't get elected Dog Catcher.
Maybe I could if I ran as a Dem.