Everyone thinks the "Do Girls Fart" thread is the longest. but
we were wrong.
The longest thread is PTT forum's "Sales, Promotions, Deals"
thread.
Do Girls Fart (2003 - 2010) Link here (Sorry I got the last
post 
>>> http://sgforums.com/forums/18/topics/43069
Sales, Promotions, Deals (2007 - Present) Link here
>>> http://sgforums.com/forums/1507/topics/253246
Edited: Ah Lau is correct
The longest thread is actually:
How Often Do You Think Of Sex??? (2005 - 2016) Link here
>>> http://sgforums.com/forums/1991/topics/142669
