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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.

Did you use Reader and share items in there? If so it seems as if Buzz just re-uses those settings.