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The same goes for sending SMS messages. If you have not used all of your allotted 160 characters then there is no excuse for writing 'CUl8r'. The time the sender feels he has saved is lost again when the bemused recipient attempts to decypher the "abbreviation". Not only that, but one gives the recipient the impression that one neither cares enough about him to write the message properly nor has a knowledge of basic written etiquette.