Conegamer on 21 February 2015
The Nintendomination thread, with around 14k:
http://gamrconnect.vgchartz.com/thread.php?id=171220&page=1
Aside from that, the Nintendo@E3 thread had around 2,400 posts. The Fire Emblem Awakening thread had around the same figure (2,500), the London 2012 Olympics thread 1,700, Xenoblade 1,600...and I think that's all the ones above 1,000 posts. A few got close, like the 2013 Gamescom thread or the MH3U thread (both around 900 posts), but only those five above the 1k mark.
