** Human Development Index (HDI): Developed by the UNDP to measure countries' progress across the three dimensions of life expectancy, education and GDP per capita; correlates with Facebook penetration rates, though with exceptions, as countries with high Facebook penetration rates also have high HDI, but not all countries with high HDI necessarily have high Facebook penetration rates (e.g., Saudi Arabia and Libya). | ** Human Development Index (HDI): Developed by the UNDP to measure countries' progress across the three dimensions of life expectancy, education and GDP per capita; correlates with Facebook penetration rates, though with exceptions, as countries with high Facebook penetration rates also have high HDI, but not all countries with high HDI necessarily have high Facebook penetration rates (e.g., Saudi Arabia and Libya). |