
Digital Sky Technologies (DST – based in Russia), has invested approximately $200 million for a 2% stake in Facebook. DST also owns VKontakte (Russia’s most popular social networking site with over 34 million users), and is the largest internet investor in Russia and Eastern Europe.
Note: VKontakte is very similar to Facebook in both design and functionality.
Here’s The Official Press Release

CheckFacebook is a research tool that tracks users on Facebook. The site represents community information both statistically and graphically, with further analysis focused on the USA. Articles related to Facebook are also added daily, and the developer behind CheckFacebook (Nick Gonzalez) looks to make this a powerful tool for marketers and researchers focusing on Facebook (the fourth most visited site on the web, after Google, Yahoo!, and YouTube).
Follow Nick Gonzalez On Twitter