Phishing in 2013:
Step 1... Register for a ridiculous amount of recycled yahoo accounts.
Step 2... Submit password reset requests under that email account.
Step 3... Get email confirmations and gain access to old social profiles, news services, shopping carts (that might have credit card info), etc..
Unethical business idea: input an email address for an auto submission for password resets across every major social service, publishing platforms, and ecommerce shopping carts... Business has probably never existed because email companies haven't been dumb enough to make it so simple to steal others accounts.
PS. Yahoo, this is not only a stupid idea, it is also irresponsible!