If you are the administrator of your g-book then you should be able to block the wankers ID and most g-books also give you the option to block their IP at the same time, if however your G-book is hosted and administrated by another site you have to apply to them to block the dude.
There's loads of IP tracking software available to d'load off the net and they all work pretty well, although some have trouble with IP stacks and you'll only ever pin point the PC not the user, unless you hack their PC and look at Packet or cookie dates etc (this is all too easy.)
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