Facebook - yes, very much needed. traffic, the need for visitors worldwide. But in Russia all use vkontakte. a third of all traffic! I'd like to be able to integrate not only with facebook, but with vkontakte
Yes, Russia and China - the last remaining big markets that hold it on their own. Vkontakte and Odnosklassniki, however, are much clumsier to integrate with. We're likely to leave it for 3rd party devs.