I've pressed it a couple of times in my threads and I still have no idea what it does.
Does anyone know what it does?
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It's a permalink button. If you want to link to a specific post, hold your mouse over that button and hit "copy link," and it will give you the permanent link to that post, which you can then use elsewhere.
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I'm not entirely sure what it does, but considering what it looks like, i imagine it links this thread to the profile's linked websites, facebook, twitter and the like.. check there and see if anything has come up, hope this helps..