Whenever someone adds you on Skype and asks you to provide proof or confirmation on their profile.
Always post a screenshot of the Skype conversation on the Profile of the user and tell them to respond to the Visitor message.
If they do not respond to the Visitor message, it means they're trying to trick you.
Be sure to report these tricksters in the Scammer's Grave. http://www.mpgh.net/forum/forumdisplay.php?f=165