India too...( where whatsapp adoption spread virally from blackberry, symbian, etc first and smartphones later)

i work on an im client[1], and my mom sent me a link about whatsapp :)

[1] to be fair, verbs.im is a gtalk/aol/yahoo multi-protocol client. infact, one day we could wrap over whatsapp as well. not exactly re-building a new graph but re-using your existing lists.