This post on Weibo is a bit older than the b-day one... but it brings back memories from the MIT days (specificly the Guang Zhou promo GuiLun went to, the insider was mentioned behind the scenes) 

Translation: (starting in the text box) 
Aaron's original post: @ Yan Ya Lun: one is meimei, one is cookie, what should the next one be called? (then the pic of the virtual puppy)

Gui's response: //@Gui Gui Wu Ying Jie: BOBOBO

Aaron's response: bobobo again (cying icons) hahaha

A very small interation but, still makes me happy that they keep refering to MIT days and their inside jokes :)

If you do not understand where the refernce is from... please watch this and it might jog your memory~

http://www.youtube.com/watch?v=0SreXk2hOM8&feature=relmfu

(if anyone needs a translation for the vid.... comment and i will try my best to translated it.... but it will take a while) 
(if you ask me to translate... i might get carried away and translate the part before the one I linked you to... all becuase GuiLun is so cute X3)