Internet – Registering millions of customers

The Shenzhen-based chat service QQ, operated by the Tencent company, is under orders to register all its customers, Global Voices reported a few days ago. The local police, in charge of keeping order at the internet, wants is to collect the identities of million of its users. How many customers they actually have is unclear since many users have a multitude of identities for different purposes.
Registering itself is so much part of the way how China is administered, I'm not sure whether it really means that much.
One of the bloggers suggests that the Shenzhen public security is overstepping its authority by asking users from all over the country and even abroad to register. But the logistical challenges seem almost unthinkable. Last year March the company’s servers got into problem as six million customers were online at the same time. That means there are at least six million identities to register, unless some of these users talked to themselves of course.