How often do you change your yahoo or msn id ?

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I know many persons that change their id after 1-2 or 3 months , there are people who change their id's when they make a new boyfriend of girlfriend, there are people who change their id's after a new year comes for example: "john_king2006 and john_king2007", others change their id's from silly id's to cool id's and many other suff... do you change you id often ? I have my id for 3-4 years and i haven't changed it !