Checking ex's myspace and aim?

As far as I know, there are trackers that can be used in AIM, but they usually come in the form of a link in their buddy info. You have to click on the link to be tracked, and you will usually be able to tell if this is the case. As for myspace, yes, there are trackers, but they can only tell him your computer's IP address and your general location in the country, or another country, as well as what Internet Service Provider you use(AOL, etc.) So don't fret. = )