All the contacts in my address book were sent an e-mail titled "a nice website" with a link. After sending it, the contents of my address book were wiped out

I have e-mailed everyone to let them know it was a hijack. One person so far e-mailed me to THANK ME FOR THE LINK! I warned her about what had happened and advised copying her address book immediately. Apparently, it looks legit. when you click on it. Everyone else could tell from the spelling and grammar that it wasn't really from me.

I have contacted Yahoo customer service who advised me to call yahoo account authorization, which is only open on weekdays, and to change my password.

I have a Mac and have never had to worry about viruses! What kind of scumbucket does this kind of thing? What do they get from it? I read the thread about the credit card number being stolen, which is worse than this. Be careful out there!