Please, Bungie, never add a public chat or trading into this game. Trading may be acceptable if it's inventive and very limited somehow. I don't want to hear/see everyone else's crap flooding my screen. It would take away from the air that the game has. Also, I love claiming my items and gear as my own- ones that I've unlocked and found
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Some form of chat or in game communication method is needed other than the limited fire team chat. As for trading the only logical method of trading I could see implemented is a timed trade window for drops only to those who were present when the item was picked up.