On Chinese forums, the original post is the 'first floor' (楼主), so 二楼 is the very first reply. 'Sofa' (沙发) culture around 2005-2015 meant users raced to grab 二楼 on popular threads - an early version of 'first!' culture.
mistakes
In Chinese usage 一楼 is the ground floor, 二楼 the floor above. In British English 'first floor' is roughly Chinese 二楼, but in American English 'second floor' matches Chinese 二楼. Be careful when translating.
