Yes you can see all the posts made by one person by going to their profile and clicking on their maessages..But this will only allow you to look back for one week, you can look back further, but that function is call search and it is broken at the moment.
You can update your profile by clicking on the (Update profile button) right at the top of the board, next to your user name..
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Fri 16 Mar 2012, 20:53,
archived)
You can update your profile by clicking on the (Update profile button) right at the top of the board, next to your user name..