Skype said Tuesday it is investigating a new tool that collects a person’s last known IP address. The tool could be shown without adding the targeted user as a contact by looking at the person’s general information and log files. Skype acknowledged a research paper that showed how a Skype user’s IP address can be determined without that user knowing. An IP address is an important piece of information that can be used to track the approximate location of a user and their service provider. But the information is not necessarily accurate, as a person could be using a VPN.”]