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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I have seldom used the share feature. I'm in such a habit of pasting the link to my twitter or facebook myself. My Bungie-self and personal-self are quite intertwined on my social media outlets.