All you have to do is to register and to collect 12 people who'll register to the site through the link you'll been given after the registration.
http://www.freepremiumaccounts.com/?r=18773

Thanks in advance.

That's bullshit. Not true at all. Cos' I tried it.

Yeah, it's proabably a scam scheme. I'd suggest not putting your e-mail address on sites like that, unless you want your inbox full of spam.

And it's probably against the rapidshare policy.