title: How Alexa can find out my country if I'm using proxy?
body: <p>In Iran, Facebook has filtered by government for (at least) 3 years; so the only way to gaining access to Facebook is by proxy or VPN. In that way IP address that appears to websites is from another country.
  My question is if no one can access to Facebook directly from Iran, how it can possible that Facebook is rank 6 in this country(http://www.alexa.com/topsites/countries/IR)? In other words, how Alexa can find out my country if I'm using proxy or VPN?</p>