Hacking is possible but not likely. I think it's a) your computer is a zombie or b) you fell for one of those phishing scams. Have you recently clicked on one of those links that promise to let you know who has blocked you from their messenger? That seems to be the most common problem among my friends. They ask you to give your password and then send the same message to all of your contacts. In any case, use some antivirus and/or antispyware and DO change your password, because, if you gave it away, they might change it.
Source(s):
http://en.wikipedia.org/wiki/Phishing
http://en.wikipedia.org/wiki/Zombie_computer


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