There is a hacked version of Skype available to those who know where to find it which can render other Skype users' information merely by "Adding a contact" and viewing the targets "card".
At the moment, it's thought that the hack is limited to little more than the ability to gain username, location and IP information. However, this harvest is expected to greatly expanded at any time and maybe already has.
Edited by Deadbeat (Fri 27-Apr-12 14:00:15)