I can't think of any reason why I'd want to share a Bungie thread on Facebook or Twitter, since I generally prefer to keep those aspects (anonymous and personal) separated.
Anyways, I'm interested to know if you've used them.
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If I had a facebook account I most certainly would not share Bungie.net things on in with my friends in the real world. I'm a closeted nerd, if I have anything to say about it my friends will never know the depths of my video game and internet habits.