hey , you dont get worms when you log in .....
you only get worms when you recieve a file from your contact which
is infected
the symptom you most likely kena is 
ut
of nowhere , your contact suddenly set you a file , with phrase
tempting you to recieve it. You accept it , you kena.
Best way to prevent it is when someone send you file , you ask and
comfirm if the file is sent by him and not by the worm
