I used gmail for maybe a year many years ago, Google Buzz ended up following people I've never talked to, including someone who spammed me once.
Heh, interesting, I'd say it definitely was made to jump start off of Gmail users, works well for everyone I know, but looks like there are exceptions.
Interesting. They might be using a heuristic, or they might be auto-following people who follow me from their address books.
I keep my full address book in Google Contacts (1000+ ppl, including long-gone friends/workmates/classmates). Perhaps because I use Gmail as my main personal account it was able to figure out who was who.