Facebook already existed when this was written. HN was just around the corner and fits a lot better, imo. I figured "you and I" referred to developers and entrepeneurs, not the general public.
Every, if you bothered to get your university internal mail unlocked.
I had to send them a mail with the website of my German university and how our e-mail addresses looked, about 6 weeks later I was able tor register.
Note: I went to a university in the US but not an Ivy
Then again maybe he was just a big fan of his MySpace page at the time.
[1] Creepers being defined as people who just trolled social networks looking for friends/sex/whatever, that was new and terrifying to a lot of people then.