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there are website which they use like http://www.scaninvisible.com
E-Buddy is a type of mobile instant messaging program, such as AOL's Instant Messenger. It can interface with other instant messaging programs, such as Windows Live Messenger, Yahoo Messenger, and AIM.
buddy
E buddy is a browser based web and mobile messenger service. eBuddy supports Windows Live Messenger, Yahoo! Messenger, AIM, Hyves, ICQ, Google Talk, MySpace Instant Messenger and Facebook Chat using one interface. eBuddy can also be accessed from mobile platforms such as Apple iOS, Google Android, Nokia Symbian and Microsoft Windows Phone 7.
Buddy list
cityville
nuzailcool
Password - 1961 Elizabeth Ashley vs- Buddy Hackett 3-22 was released on: USA: 20 February 1964
Password - 1961 Phyllis Newman vs- Buddy Hackett 2-24 was released on: USA: 29 July 1963
It means you're not on their buddy/friends/contact list.
You go into files and click add friend....its really complex i know
Sorry to bust your excitement but generators are fake.