Well, i for one would love to see this plugin made.
Recently a few of my friend has got their messenger account highjacked, and it is really frustrating when that happens. They all wish to find out who the person is, because it seems like they got highjacked because they had really easy secret answers. The person highjacking the account is probably someone they know. It would be nice to know the ip of the person, so that they can track down the highjacker, and give him/her a good pounding