I hope you all realize that when you post that you got one and the address, you are giving away information they can use to help tie your bitcoin address to an online identity.
My suggestion, just ignore the dust. It likely isn't going to get confirmed.
No the address that was sending the coins from was linked to an address associated with a gambling site. It apparently was being sent out as a form of advertising.
Well even if the sender isn't using it to find out who is associated with what addresses, anyone reading the thread can...