No, you dont. As I see you can forward this mail with your explanations to hacks@blizzard.com

I did that, but the link in shane-o's post says to contact them in addition to forwarding the email.
Well, I got an automated email from them saying they had received my hack report.

I got the exact same email, also addessed to Zhang, and I think I forwarded it to support@blizzard.com, which I don't even know is a real address, and from which I haven't heard a response. It also freaked me out because I kept the same password for a lot of sites (as if the Lulzsec thing didn't convince me) so I finally fixed that issue. Glad to see it was a spoof!