Do you plan to make the integration with Vk.com (vkontakte)? Registered 260 million people, and daily attendance of 60 000 000, it is a big market, and if you can do the integration, you get a huge pile of Russian-speaking client.
  S only now facebook truly integrated. I know that there Jfbconnect or whatever it is ... but ...The company has VK API, and documentation in English, I think, if not, I am willing to help you to provide all the necessary information and support on any issue, at least as a Russian-speaking. My father was a translator, so I can help with a full-time technical translation.