576 Folsom St
San Francisco, CA 94105
Six Apart - Sales Department
548 4th Street
San Francisco, CA 94107
feedback@ is preaching to the choir.
Support requests are preaching to an increasingly pissed-off choir.
http://www.sup.com/en/contacts.html has information on it that would be useful if one wanted to contact SUP management for any reason. Say, to talk about recent (upper) management-level decisions at LiveJournal. (stolen blatantly from idonotlikepeas, via a few people)