Which is the best Messenger ion NET???

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Hey guz and Glz What do U think? which is the best Messenger in net??? Hey which do U think have the best Chat rooms??? Hey which is the one which has th largest coverage??? Which is the oe whic is more User Interface??? Come on.... Is it ICQ, SKYPE, GTALK, YAHOOMessenger, Rediff BOL......or any thing else. Come on reply