The Osama assassination one is fake.
1) Approximately two months ago - from 06/15/09 to 06/15/10
2) both 06/15/09 and 06/15/10 were Tuesdays? Not possible.
3) Alright /b/ .... 2 mil. board
The order of the posts is such that the anon on top replied to the guy below him. The problem here is that he "guessed" the exact post number and subject of the post 2 minutes before the other anon posted.
Also looking at the timestamps you can see that the guy posted calling him out before the other guy even posted.