As already posted multiple times: there's was a voice chat feature in the extended alpha. I could not test it because at that time, I didn't see other players. Could be that voice chat is only allowed between squad members, but that wouldn't be a problem.
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[quote]With proximity chat, players can get to know each other and share their experiences they’ve had in Destiny. Maybe you just want to compliment someone’s awesome armor and be on your way.[/quote] It takes too long to search for someone's name, view their profile, and invite them, when you could just start talking to them with proximity chat.