I work for an advertising company. We are able to identify IP addresses for our clients. We can also tell where the posting is coming from geographicly. I'm not a tech person so I don't know how it is done but I would assume that if we can gather that information then it is available for the moderators here. As was said above, never put anything on the computer that you wouldn't want your name attached to. It definately is readily available for other to see.