Have you experienced being hack?

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I received lot of complaints that their yahoo messenger or e-mail have been hacked. Most cases were someone using their Yahoo messenger id to talk to their friends and relatives and asking for big among of money or cell cards. I did not receive only one or two complaints but more. I am getting worried that I may be one of the victim soon but I tried to be very careful and warn my family about this matter. If you have yahoo messenger, have you been hacked before? If you were the victim, how will you handle this matter?