A number of countries, including Russia and China, have put forward proposals to regulate aspects of the Internet like 'crime' and 'security' that are currently unregulated at the global level due to lack of international consensus over what those terms actually mean or over how to balance enforcement with the protection of citizens' rights.
Facebook is not a physical country, but with 900 million users, its 'population' comes third after China and India. It may not be able to tax or jail its inhabitants, but its executives, programmers, and engineers do exercise a form of governance over people's online activities and identities.