Did someone Private message you..

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did someone private message you.. well you've just open your Yahoo messenger in invisible mode or you have no friend on your yahoo list, and after a minutes or so someone Pm's you with a spam website, on how on earth did they know your own Yahoo I.D's.. i hate this thing happens just all of a sudden a stalker pm you just like and of course you be amazed because he's not on your list of friends.