In Chinese academia, what is the significance of the corresponding author, beyond 'public relation'?
I have been doing research in China for 10 years now, and hopefully I can answer your question. When a candidate is being considered for a faculty job here, only those papers where he/she was a first author or corresponding author are counted. This is because there is a rampant abuse of honorary authorships, namely colleagues and students are added even though their contribution was minimal or none at all. As usual, instead of cracking down on the abusers, more rules and regulations are put in place. This is why in most papers published from China, there are around three to four first co-authors (whom contributed equally) along with four to six corresponding authors. The consensus is currently being upped another level where some institutions are not counting corresponding authors.