Definitely not a viral campaign. I know this guy personally and he is a clever little beaver.

I am amazed people don't have friends to push it to. I upped my storage by just suggesting it to friends and family.

I invited some colleagues but Dropbox denied the referrals because they said it came from the same computer. It came from the same IP (our corp firewall). I didn't feel like fighting it because I'm under my limit anyway.