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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None at all, if anything I am frustrated that it automatically opens the drop down menu upon mouse-over as I find I often accidentally do that and then wait for it to disappear (to submit my post or whatever because it covers up the "Post" button).