Because, if you belong to organizing groups and you have a fancy phone, voila!, I hook my address book to fb and instantly know their address, phone number, IM, etc. very nice.
I can't tell you how many times I've used this feature. Zuckerberg wants facebook to be a utility - in the phone company sense of the term. he also wants it to be a platform. It becomes so necessary to your life and an avenue to everything outside facebook, no one can live without it. If you are part of any political, cultural, social organizing FB *is* precisely that: utility/platform.
shag
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