"....Different Countries, Different Habits
Turkey is the country that experienced the highest growth over the period mentioned by Pulver — 465% — and has nearly 2 million users on Facebook. I originally thought that perhaps a high number of English speakers in Turkey could partly explain the appeal of an English-only site for Turks. But I found that many of the Turkish users on Facebook don’t even know English."
More:MediaShift . Networking Without Borders::The Universal Language of Facebook | PBS