Facebook is good for keeping up with high-flying buddies, MySpace is for teenage offspring and the BlackBerry is a full-time addiction, according to top media executives who were quizzed on their personal media habits at this week's Reuters Media Summit.

"I may be the only human being on earth who's on MySpace under his own name and I am on Facebook," said Strauss Zelnick, chairman of Take-Two Interactive Software , the video game company behind Grand Theft Auto.

Peter Levinsohn, head of News Corp's Fox Interactive Media, described such behavior as that of an "uber user" who is on both popular social network sites but uses them toward different ends.

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