Birthdays come once a year and we get heaps of wishes on Facebook. It may be your best friends, old school friends or even people you have met only once before. Your Friends might write on the wall or send a personal message.
But, something doesn't have to be as big as Facebook to be wildly successful, and I think that RenRen could be the first of many native langauge networks that beging to encroach upon Facebook, Twitter and even Linkedin's territory. One thing is clear: there are a lot of options for social network users in China, and not the ones you and me have necessarily have heard of.